Airline Challenges to Airport Rates and Charges

I. Introduction

The relationship between airports and airlines in the United States is defined by a complex web of federal statutes, regulatory policies, contractual agreements, and judicial precedent. At the heart of this relationship lies a fundamental tension: airports, as natural monopolies controlling infrastructure, possess pricing power without direct market competition over the airlines that depend on their facilities to conduct business. Airlines, as the primary revenue source for 28 of 31 large-hub airports, bear the direct cost of airport operations and capital programs, yet often have limited influence over how those costs are determined and allocated.

This tension has produced more than five decades of litigation and administrative proceedings, from the United States Supreme Court to the Department of Transportation’s administrative law judges. The resulting body of law, codified in 49 U.S.C. § 47129 and the DOT's 2013 Rates and Charges Policy, governs rate-setting at all 31 U.S. large-hub airports. These cases provide context for airport finance professionals, bond counsel, airline negotiators, and financial advisors working in this industry.

This article provides a analysis of the major judicial and administrative decisions that have shaped airport ratemaking law. For each case, we examine: why the airline brought the challenge; what the airline sought to achieve; the legal arguments advanced by both sides; how the court or administrative body resolved the dispute; and, critically, the implications for airport rate-setting methodology. The cases are presented chronologically, allowing the reader to trace the evolution of legal doctrine from the foundational “fair approximation of use” standard articulated in 1972 through the modern multi-forum disputes that characterize today’s airport-airline conflicts.

This article addresses the statutory and regulatory framework that underpins these disputes, including the Anti-Head Tax Act, the Airport and Airway Improvement Act, the FAA’s Grant Assurances, the DOT’s Rates and Charges Policy, and the expedited dispute resolution procedures commonly known as the “Rocket Docket” (49 U.S.C. § 47129). Together, these authorities create the legal environment in which airport rate disputes arise and are resolved.

II. The Legal and Regulatory Framework

Before examining individual cases, it is to understand the statutory and regulatory architecture that governs airport rates and charges in the United States. This framework has evolved over several decades, with each new statute or policy building upon—and sometimes contradicting—its predecessors.

A. The Anti-Head Tax Act (49 U.S.C. § 40116)

The Anti-Head Tax Act (AHTA), originally enacted in 1973 as part of the Airport and Airway Development Act amendments, prohibits state and local governments from levying taxes on persons traveling in air commerce or on the gross receipts of airlines. The statute serves a dual purpose: it prevents state and local taxation that could burden interstate air commerce, while simultaneously permitting airports to impose “reasonable rental charges, landing fees, and other service charges” for use of airport facilities.

The key distinction is between a “tax” (prohibited) and a “fee” or “charge” (permitted). The Supreme Court addressed this distinction directly in Evansville-Vanderburgh Airport Authority District v. Delta Air Lines (1972), establishing that airport user charges are permissible so long as they provide a “fair, if imperfect, approximation of the use of facilities for whose benefit they are imposed.” This standard—the “fair approximation of use” test—became the foundational principle of airport ratemaking law.

The AHTA does not prescribe a specific ratemaking methodology. Rather, it establishes the outer boundary: charges must be reasonable and must approximate the cost of services provided. Within that boundary, airports retain broad discretion in how they structure and calculate rates.

B. Airport and Airway Improvement Act and Grant Assurances (49 U.S.C. § 47107)

Any airport that accepts federal Airport Improvement Program (AIP) grants is bound by a series of Grant Assurances—legally enforceable commitments that constrain how the airport operates and uses its revenues. The most important for rate disputes are:

• Grant Assurance 22 (Economic Nondiscrimination): The airport must make its facilities available on reasonable terms and without unjust discrimination. This does not require identical rates for all users, but rates must reflect rational cost allocation principles.

• Grant Assurance 24 (Fee and Rental Structure): The airport must maintain a fee and rental structure that makes the airport as self-sustaining as possible. This creates a tension with airline cost concerns—the airport must charge enough to be self-sustaining, but not so much as to be unreasonable.

• Grant Assurance 25 (Revenue Use): All airport revenues must be used exclusively for airport purposes. This is the “revenue diversion” prohibition. Revenue diversion occurs when airport-generated funds are transferred to a city’s general fund, used for non-airport transportation projects, or otherwise diverted from airport purposes. The FAA enforces this assurance consistently. See 49 U.S.C. § 47107(b).

Violations of Grant Assurances can result in loss of future AIP funding, enforcement actions by the FAA, and orders requiring the airport to change its practices. Airlines frequently invoke Grant Assurance violations in rate disputes as an additional basis for challenging airport practices. For detailed guidance, see the FAA Airport Compliance Manual (Order 5190.6B).

C. DOT Rates and Charges Policy

The Department of Transportation has issued formal policy statements on airport rates and charges three times: in 1996, 2008, and 2013. The 2013 Policy on Airport Rates and Charges is the currently effective version and represents the most articulation of federal standards for airport ratemaking.

Key principles of the 2013 Policy include:

• Rates must be “fair and reasonable” and not unjustly discriminatory.

• Airports must be financially self-sustaining, consistent with Grant Assurance 24.

• Revenue diversion is prohibited—all airport revenues must be used for airport purposes. See the FAA Revenue Use Policy.

• Residual ratemaking cannot be imposed unilaterally—it requires airline consent through an airline use agreement (AUA). Compensatory rates may be established through a unilateral rate resolution.

• Airfield rates shall not exceed the airport’s costs of providing airfield facilities and services, unless airlines have agreed otherwise in an AUA.

• Historical cost, not fair market value, is the appropriate basis for airfield rate base calculations. This principle was established through the LAX I and LAX II proceedings.

• Imputed interest on historical cost of airfield facilities may be included in the rate base even when the facilities are not debt-financed.

The Policy does not have the force of law in the same manner as a statute or regulation, but it represents the DOT’s interpretation of governing statutes and serves as the framework for DOT adjudication of rate complaints. Courts and administrative bodies consistently defer to the Policy in resolving airport rate disputes.

D. 49 U.S.C. § 47129: The “Rocket Docket”

Section 47129 of Title 49, enacted as part of the Wendell H. Ford Aviation Investment and Reform Act for the 21st Century (AIR-21) in 2000, established an expedited dispute resolution process for airport fee disputes—commonly known as the “Rocket Docket.”

Prior to AIR-21, airlines challenging airport rates had to pursue remedies either through federal court litigation (a slow and expensive process) or through informal FAA complaint procedures (which lacked formal adjudicatory mechanisms). Section 47129 created a middle path: a structured administrative process with defined timelines for resolution.

Under Section 47129, an air carrier may file a written complaint with the Secretary of Transportation alleging that a fee imposed by an airport is not reasonable. The Secretary must issue a determination within 120 days of the filing, subject to extension. The process requires the airport to bear the burden of proving that its fees are reasonable, consistent with established law. If the Secretary finds that a fee is unreasonable, the airport must adjust the fee.

Airlines filed 22 Rocket Docket complaints between 2020–2024, securing rate reductions in 14 cases (DOT Office of Aviation Analysis, 2025). The Rocket Docket provides a faster and more specialized forum than federal court litigation. The DOT possesses extensive experience in airport finance, and its administrative law judges are familiar with the technical complexities of ratemaking methodology, cost allocation, and rate covenant structures. Key features of the Section 47129 process include:

• Expedited Timeline: The 120-day determination requirement forces faster resolution than traditional litigation, though extensions are common in practice for complex cases.

• Burden of Proof on Airport: The airport bears the burden of justifying that its fees are reasonable. This is significant—in federal court, the airline as plaintiff typically bears the burden. The shifted burden under Section 47129 gives airlines a procedural advantage.

• Technical Expertise: DOT administrative law judges and staff have specialized knowledge of airport finance, reducing the need for extensive expert testimony on basic industry concepts.

• Scope of Review: The DOT reviews both the methodology (is the approach reasonable?) and the application (does the methodology produce reasonable results?). As LAX III demonstrated, a sound methodology can still produce unreasonable or discriminatory outcomes.

• Precedential Value: While DOT administrative decisions are not formally binding precedent in the way that Supreme Court or circuit court opinions are, they are highly influential in shaping airport ratemaking practices nationwide.

The Rocket Docket has been used in several major proceedings, including the LAX III investigation and the United Airlines challenge to Port Authority of New York and New Jersey fees at Newark. It represents the primary administrative mechanism through which airlines challenge airport rates today.

III. The Foundational Case: Evansville-Vanderburgh Airport Authority District v. Delta Air Lines (1972)

A. Background and Facts

The case that established the foundational principle of airport ratemaking law originated not at a major hub but at the Evansville, Indiana regional airport. The Evansville-Vanderburgh Airport Authority District imposed a $1.00 per-passenger charge on all enplaning commercial airline passengers as a use and service charge for the airport’s facilities. Delta Air Lines and other carriers challenged the charge, arguing that it constituted an impermissible “head tax” on air travel in violation of the Commerce Clause. See 405 U.S. 707 (1972).

B. Why the Airlines Sued

The airlines’ challenge was rooted in the concern that state and local governments would use airport fee authority to impose what were effectively taxes on interstate air commerce. If every airport could impose arbitrary per-passenger charges without regard to the costs of services provided, the cumulative burden on airlines and their passengers would function as a tax on air travel itself.

Delta and the other carriers argued that the $1.00 per-passenger charge bore no reasonable relationship to the actual costs incurred by the airport in serving airline passengers. They contended that the charge was a revenue-raising measure—a tax—rather than a fee for services rendered.

C. Legal Arguments

The airlines argued that the Commerce Clause prohibited states from burdening interstate commerce through user charges that were not closely calibrated to the costs of services provided. They urged the Court to adopt a strict proportionality requirement: airport charges must precisely correspond to the costs of facilities used by the paying party.

The airport authority defended the charge as a reasonable user fee, arguing that passengers who use the airport’s terminal facilities, roadways, and services should contribute to their cost. The airport contended that a per-passenger charge was a rational proxy for the relative use of airport facilities by different carriers and their passengers.

D. The Supreme Court’s Decision

Justice Brennan, writing for a 7-1 majority (Justice Douglas dissenting, Justice Powell not participating), upheld the airport’s per-passenger charge. The Court drew a key distinction between a “tax”—which would be impermissible under the Commerce Clause—and a “user fee” for airport facilities and services.

The Court held that airport user charges are constitutionally permissible so long as they bear a “fair, if imperfect, approximation of the use of facilities for whose benefit they are imposed.” The Court explicitly rejected the airlines’ demand for mathematical precision, recognizing that airport cost allocation is inherently approximate and that practical considerations make exact proportionality impossible.

Justice Brennan further noted that the charge was designed to help defray the costs of airport facilities made available to airlines and their passengers. The Court observed that passengers who use the airport unquestionably benefit from its facilities and that a per-passenger charge reasonably approximates the relative use of those facilities by each carrier.

E. Implications for Airport Ratemaking

The Evansville decision established three principles that continue to govern airport ratemaking today:

1. The Fair Approximation Standard: Airport charges need not achieve mathematical precision but must bear a reasonable relationship to the costs of providing airport facilities and services. This standard gives airports substantial flexibility in designing rate structures.

2. User Fee vs. Tax Distinction: So long as airport charges are reasonably related to the costs and benefits of airport services, they constitute permissible user fees rather than impermissible taxes on air commerce. This distinction protects airports’ ability to charge for their services while limiting the potential for disguised taxation.

3. Practical Administration: The Court recognized that practical considerations of airport management make exact cost allocation impossible and that an imperfect but fair approximation is sufficient. This principle has been invoked repeatedly in subsequent cases to defend airports’ rate-setting discretion.

The “fair approximation of use” standard became the baseline against which all subsequent airport rate challenges have been measured. It is cited in virtually every major airport rate case and is embedded in the DOT’s Rates and Charges Policy.

IV. The “Multiple Cash Register” Challenge: Indianapolis Airport Authority v. American Airlines (1984)

A. Background and Facts

In the early 1980s, American Airlines and other carriers at Indianapolis International Airport challenged the airport authority’s rate-setting methodology. The airport maintained what Judge Posner described as a “multiple cash register” approach: airline revenues were calculated and collected separately from concession and other non-airline revenues, with no cross-referencing between the two streams. Airlines were charged rates designed to cover the full allocated costs of airline-used facilities, while the airport retained all concession profits without crediting them against airline charges. See 733 F.2d 1262 (7th Cir. 1984).

B. The Airline’s Argument

American Airlines argued that the airport’s monopoly position created an obligation to set rates based on an integrated analysis of all airport revenues. Because the airport controlled facilities that airlines had no choice but to use, the airlines contended that the airport could not isolate airline revenues from concession revenues and charge airlines the full cost of operations while retaining substantial concession profits.

The airlines urged the court to require that concession revenues be credited against airline costs, thereby reducing airline rates. They argued that the airport’s revenue streams were economically interrelated—concession revenues existed only because airline passengers used the airport—and that fairness required recognizing this interdependence in rate-setting.

C. Judge Posner’s Decision

Writing for the Seventh Circuit, Judge Richard Posner ruled in favor of the airlines. His opinion applied economic principles of monopoly regulation to airport ratemaking, concluding that the airport’s failure to integrate concession revenues into its rate calculations was unreasonable.

Posner reasoned that airports function as natural monopolies and that monopoly pricing principles constrain how they may charge for their services. He criticized the “multiple cash register” approach as a device that enabled the airport to extract monopoly rents from airlines while appearing to charge only compensatory rates. If the airport earns substantial profits from concessions—profits that exist only because airline passengers use the facility—then rational ratemaking requires considering those revenues when setting airline rates.

D. The Reversal: Why This Case Matters

The Indianapolis decision represented the high-water mark of airline-favorable ratemaking doctrine. However, it was effectively overruled ten years later by the Supreme Court’s decision in Northwest Airlines v. County of Kent (1994), which held that airports need not credit concession revenues against airline rates.

Despite being superseded, the Indianapolis case remains important for several reasons. First, Judge Posner’s economic analysis of airport monopoly power continues to inform academic and policy discussions about airport ratemaking. Second, the case illustrates the tension between economic theory (which suggests integrated revenue analysis) and the practical reality of airport finance (which relies on diversified revenue streams to support capital programs). Third, the case demonstrates that Between 1984 and 1994, the Seventh Circuit's Indianapolis decision (733 F.2d 1262) and the Supreme Court's Kent County ruling (510 U.S. 355) directly contradicted each other on concession revenue offsets.

V. The Concession Revenue Question: Northwest Airlines v. County of Kent (1994)

A. Background and Facts

Gerald R. Ford International Airport in Grand Rapids, Michigan, operated by the County of Kent, imposed landing fees and terminal rental rates on Northwest Airlines and other carriers. Northwest challenged these rates, arguing that the airport was required to credit concession revenues (from parking, car rental, food service, and other non-airline operations) against airline costs, thereby reducing the rates airlines paid. See 510 U.S. 355 (1994).

The dispute centered on a fundamental question: must an airport offset its airline rates with profits earned from non-airline commercial activities? Northwest contended that the Airport and Airway Development Act (now the AHTA) required such an offset, pointing to the language requiring airport charges to be “reasonable.”

B. The Airlines’ Argument

Northwest argued that the AHTA’s requirement of reasonable charges necessarily implied that airports must consider all revenue sources when setting airline rates. If an airport earns substantial profits from concessions, parking, and car rental operations—activities that depend on airline passenger traffic—then charging airlines the full allocated cost of airport facilities, without any concession revenue offset, produces rates that exceed the airport’s true net cost of serving airlines. Northwest invoked the Seventh Circuit’s Indianapolis decision as support for this position.

C. The Airport’s Defense

The County of Kent argued that nothing in the AHTA required airports to cross-subsidize airline operations with concession revenues. The airport contended that its rates were compensatory—calculated to recover the airport’s costs of providing airline facilities and services—and that the reasonableness standard did not require airports to share non-airline revenue with airlines. Forcing airports to credit concession revenues against airline rates would, the airport argued, reduce airports’ incentive to develop and improve commercial operations.

D. The Supreme Court’s Decision

The Supreme Court sided decisively with the airport. The Court held that the AHTA does not require airports to offset airline rates with concession revenue surpluses. The statute permits airports to impose “reasonable rental charges, landing fees, and other service charges” for use of airport facilities, and reasonableness does not require that airports share non-airline revenues with airlines.

The Court reasoned that airports and airlines operate in distinct economic spheres: airports provide infrastructure, while airlines provide transportation services. Concession operations represent a separate line of business that airports develop and manage independently. Requiring airports to use concession profits to subsidize airline rates would conflate these distinct functions and undermine airports’ incentive to develop non-airline revenue streams.

E. Implications for Airport Finance

The Kent County decision fundamentally reshaped airport financial management. Its implications include:

1. Revenue Stream Separation: Airports are free to maintain separate accounting for airline and non-airline revenues. The “multiple cash register” approach that Judge Posner criticized in Indianapolis was now implicitly endorsed by the Supreme Court.

2. Incentive for Commercial Development: By confirming that airports may retain concession profits, the decision incentivized airports to invest in commercial development—retail, food and beverage, parking, car rental, and other non-airline activities. This has been a major driver of the modern airport commercial revenue model.

3. Residual vs. Compensatory Methodology: The decision strengthened the case for compensatory ratemaking, under which airports charge airlines a calculated cost share and retain all non-airline revenues. Under residual ratemaking, airlines receive credits from non-airline revenues by agreement—but Kent County confirmed that such credits are a matter of contractual negotiation, not legal entitlement.

4. Airline Negotiating Leverage: While the decision reduced airlines’ legal entitlement to concession revenue credits, it did not eliminate airlines’ practical ability to negotiate for them. Revenue sharing remains a common feature of airline use agreements, but it is now clearly understood to be a contractual concession, not a legal right.

VI. The LAX Trilogy: DOT Investigations of Los Angeles International Airport (1995–2007)

No airport has been the subject of more DOT rate investigations than Los Angeles International Airport (LAX). Three separate proceedings—known as LAX I (1995), LAX II (1997), and LAX III (2007)—addressed progressively more complex issues of airport ratemaking and produced some of the most detailed articulations of federal rate-setting standards.

A. LAX I (1995): The Fair Market Value Question

Background

The City of Los Angeles, which operates LAX through its Department of Airports (now Los Angeles World Airports, or LAWA), calculated airfield rates using a rate base that included the fair market value of airport land and facilities. Airlines challenged this approach, arguing that the use of fair market value—as opposed to historical (original) cost—inflated the rate base and produced unreasonably high landing fees.

The fair market value methodology was particularly significant at LAX because the airport sits on extremely valuable real estate in the Westchester neighborhood of Los Angeles. The difference between the historical cost of the land (acquired decades earlier) and its current market value was significant, and using fair market value as the rate base substantially increased the capital charges embedded in airline rates.

The DOT’s Findings

The DOT found that the use of fair market value for airfield rate base calculations was unreasonable. The DOT concluded that historical cost—the original acquisition and construction cost of airport facilities, less accumulated depreciation—is the appropriate basis for calculating airfield rates. This conclusion was rooted in traditional utility regulation principles: regulated entities are entitled to recover their prudent investment in plant and equipment, plus a reasonable return, but are not entitled to revalue their assets at current market prices.

However, the DOT also found that airports may include imputed interest on the historical cost of airfield facilities, even when those facilities are not financed through outstanding debt. This represents a reasonable measure of the capital cost of providing airfield services—the opportunity cost of capital invested in airport facilities. The DOT further ruled that roadway and ground access costs are properly allocable to airfield operations when they functionally support aircraft movement and airport access.

Significance

LAX I established the fundamental principle that airfield rates must be based on historical cost. This principle was later codified in the DOT’s 2013 Rates and Charges Policy and applies to every federally obligated airport in the United States. The decision effectively eliminated a potentially significant source of rate inflation: if airports could revalue their land and facilities at fair market value, airfield rates at airports on valuable land (LAX, SFO, JFK, EWR) would far exceed any reasonable relationship to the costs of providing airfield services.

B. LAX II (1997): Confirmation and Refinement

The second LAX investigation reinforced and refined the principles established in LAX I. The DOT reiterated that fair market value is an unreasonable basis for airfield ratemaking and confirmed historical cost as the appropriate foundation. The proceeding also addressed additional cost allocation issues, including the treatment of depreciation schedules, capitalization policies, allocation of joint and common costs, and working capital requirements.

LAX II established regulatory consistency by demonstrating that the DOT’s position on historical cost was not a one-time determination but a settled policy position that airports could rely upon in structuring their rates. The decision also expanded the discussion of cost allocation methodology, providing detailed guidance on how airports should allocate costs among airfield, terminal, and other cost centers.

C. LAX III (2007): Methodology vs. Application

Background

The third and most detailed LAX investigation examined a different set of issues than its predecessors. By 2007, the fair market value question had been resolved; the dispute in LAX III centered on the compensatory rate methodology used by LAWA to calculate terminal rental rates and the allocation of maintenance and operations (M&O) costs.

Airlines in Terminals 1 and 3 (including Alaska Airlines, AirTran Airways, ATA Airlines, Frontier Airlines, Midwest Airlines, Southwest Airlines, and US Airways) filed complaints alleging that LAWA’s rate-setting practices were discriminatory, producing higher effective rates for T1/T3 carriers than for carriers in other terminals. The complaints raised technical but consequential questions about how terminal space is measured, how costs are allocated among multiple terminals, and whether the resulting rates are equitable across all carriers.

Key Findings

The DOT’s findings in LAX III were nuanced and represent the most sophisticated analysis of airport ratemaking in any DOT proceeding to date:

1. Rentable vs. Usable Space: The DOT found that LAX’s use of rentable square footage (as opposed to usable space) as the allocation basis for terminal costs was generally reasonable. Rentable square footage is the standard measurement convention in commercial real estate and includes a pro-rata share of common areas. The DOT accepted this approach as a fair method of allocating terminal costs among airline tenants.

2. M&O Cost Allocation: The DOT found that LAX’s maintenance and operations cost allocation process was reasonable in its methodology. The airport used functional allocation based on facility-specific and usage-based factors, which the DOT accepted as consistent with standard cost accounting principles.

3. Compensatory Method Acceptable: The DOT confirmed that a compensatory rate-setting methodology is an acceptable approach that satisfies federal fairness standards. Under compensatory ratemaking, the airport calculates each airline’s share of costs and charges accordingly, retaining all non-airline revenues.

4. Discriminatory as Applied: Despite finding the overall methodology sound, the DOT concluded that the application of the methodology was discriminatory as applied to T1/T3 carriers. Specific aspects of how costs were allocated and rates were calculated produced systematically higher charges for T1/T3 carriers than for carriers in other terminals, without adequate cost justification.

The Methodology vs. Application Distinction

LAX III’s most important contribution to airport rate law is the distinction between methodology and application. An airport may adopt a perfectly reasonable rate-setting methodology—one that satisfies all theoretical and regulatory requirements—yet still produce discriminatory outcomes if the methodology is applied in a way that systematically disadvantages certain carriers.

This distinction has implications for airport rate-setting. It means that compliance with federal standards requires not only a defensible methodology but also ongoing monitoring of how that methodology affects individual carriers. Airports cannot simply design a rate structure, implement it, and assume compliance; they must analyze the actual results to ensure that no carrier or group of carriers is bearing a disproportionate share of costs without justification.

VII. Equalized Rates and Burden of Proof: The MIA Investigation (1996)

A. Background

The DOT’s investigation of Miami International Airport (MIA) addressed a different question than the LAX proceedings: whether an airport’s equalized terminal rental rate structure—charging all airlines the same per-square-foot terminal rent regardless of which specific terminal they occupy—is reasonable.

MIA’s terminal complex includes multiple concourses with varying ages, conditions, and cost structures. Rather than calculating terminal-specific rental rates that reflected the actual costs of each concourse, MIA established a single equalized rate for all terminal space. Airlines in newer, higher-cost terminals effectively subsidized airlines in older, lower-cost facilities, while airlines in older terminals paid more than the direct costs of their specific facilities.

B. The Challenge

Airlines in the older, lower-cost terminals challenged the equalized rate, arguing that they were being overcharged relative to the actual costs of their specific facilities. They contended that cost-based ratemaking required terminal-specific rates, not equalized rates that averaged costs across facilities with very different cost profiles.

C. The DOT’s Decision

The DOT found that equalized terminal rental rates are reasonable when airlines rotate through terminal facilities or when facilities are essentially equivalent in function and service capability. The DOT reasoned that where airlines use multiple terminals over time, or where all terminals provide substantially similar services, equalized pricing provides a fair approximation of costs without the administrative complexity of terminal-specific rate calculations.

Critically, the DOT also addressed the burden of proof. Airlines challenging airport rates bear the burden of demonstrating that rates are unreasonable, not compensatory, or discriminatory. Airports are not required to provide detailed cost studies showing precise cost allocation to each facility in every case; rather, they must demonstrate that their rates bear a reasonable relationship to the costs of providing services. This evidentiary standard is important because it limits the ability of airlines to challenge rates solely on the basis of theoretical alternatives—they must show that the existing rates are actually unreasonable.

D. Implications

The MIA decision supports simplified rate structures, particularly for airports with multiple terminals of similar quality and function. It gives airports flexibility to use equalized rates when facility equivalence and rotation practices justify such an approach. The decision also reinforces the principle that the Evansville “fair approximation” standard does not require mathematical precision—an equalized rate that reasonably approximates costs is sufficient, even if it is not perfectly calibrated to each terminal’s specific cost profile.

VIII. Revenue Diversion and Rate Transparency: United Airlines v. Port Authority of New York and New Jersey (2014–2018)

A. Background

The Port Authority of New York and New Jersey operates three of the nation’s busiest airports: John F. Kennedy International Airport (JFK), LaGuardia Airport (LGA), and Newark Liberty International Airport (EWR). United Airlines, the dominant carrier at Newark, filed a complaint with the FAA in 2014 alleging that the Port Authority’s fee structure at Newark was unreasonable, not transparent, and tainted by revenue diversion.

United’s complaint was significant not only because of the amounts at stake—Newark is one of the nation’s highest-cost airports—but because it challenged the financial practices of one of the country’s most powerful port authorities. The Port Authority operates under a bi-state compact between New York and New Jersey and manages an array of transportation facilities beyond airports, including bridges, tunnels, the PATH rail system, and the World Trade Center complex.

B. The Airline’s Allegations

United alleged that Newark’s airport fees were approximately 75% higher than fees at comparable facilities, including JFK and LaGuardia. The airline raised several specific concerns:

• Lack of Transparency: The Port Authority’s fee structure did not clearly explain how costs were allocated between aeronautical and non-aeronautical activities or how airport-generated revenues were used.

• Revenue Diversion: United contended that the Port Authority diverted substantial airport revenues—potentially exceeding $2 billion annually across all three airports—to support non-airport activities, including general fund operations, the PATH system, and other non-aeronautical Port Authority programs. This alleged diversion violated Grant Assurance 25 (revenue use requirement).

• Rate Unreasonableness: United argued that the inflated fees were the direct result of revenue diversion—the Port Authority charged airlines inflated rates to generate revenues that were then transferred to non-airport uses.

C. FAA Findings

The FAA’s investigation, concluded in 2018, produced findings largely favorable to United. The FAA determined that the Port Authority’s fee structure at Newark lacked adequate transparency and that fees were not reasonable when compared to documented costs and comparable airports. Specifically:

1. Fees Not Transparent: The Port Authority failed to provide clear documentation of cost allocation methodology and rate justification.

2. Fees Not Reasonable: Fees significantly exceeded what could be justified by the documented costs of providing airport services at Newark.

3. Insufficient Cost Justification: The Port Authority could not adequately demonstrate that its rates were based on documented costs and fair allocation principles.

D. Significance

The Newark case is important for several reasons. First, it demonstrates the FAA’s willingness to find against a major port authority on rate reasonableness and transparency grounds. Second, it highlights the ongoing challenge of revenue diversion at airports operated by multi-purpose authorities that manage diverse transportation assets. Third, it reinforces the principle that airport rates must be supported by documented, transparent cost allocation—opacity in rate-setting is itself a basis for regulatory concern.

The case also illustrates the limitations of regulatory enforcement. Despite the FAA’s findings, the practical remedies available—and the pace at which they are implemented—remain subjects of ongoing discussion. Revenue diversion by powerful multi-state authorities presents unique enforcement challenges that the FAA continues to address.

IX. The Modern Frontier: Southwest Airlines v. San Antonio (2024)

A. Background

The most recent major airport rate dispute involves Southwest Airlines’ challenge to gate allocation practices at San Antonio International Airport. The dispute centers on the new Terminal C facility and illustrates the evolving nature of airport-airline conflicts in an era of major capital programs and changing competitive dynamics.

B. The Airline’s Allegations

Southwest alleged that the San Antonio Airport Authority engaged in a “bait-and-switch” regarding Terminal C gate allocation. Specifically, Southwest contended that the airport made prior representations or commitments about gate access in the new terminal that were subsequently not honored. The dispute raises questions about which airlines receive gates in new facilities, under what terms and at what rates, and whether the airport’s allocation practices are discriminatory.

C. Procedural Posture

The case has followed a multi-forum trajectory that is now seen in multiple recent cases in airport rate disputes. The federal district court dismissed Southwest’s lawsuit with prejudice, finding that the court lacked jurisdiction or that the claims were not cognizable in federal court. Southwest has appealed the dismissal to the Fifth Circuit Court of Appeals.

Simultaneously, Southwest filed a complaint with the FAA alleging that the airport’s gate allocation practices are unreasonable and discriminatory. The FAA investigation proceeds independently from the appellate litigation, creating parallel proceedings that could produce different outcomes.

D. Significance for Airport Finance

The Southwest v. San Antonio case illustrates several important trends in modern airport-airline disputes:

1. Terminal Development as Flashpoint: As airports across the country pursue multi-billion-dollar terminal development programs, disputes over gate allocation, terminal access, and new facility pricing are becoming more frequent and more contentious.

2. Multi-Forum Strategy: Airlines are increasingly pursuing claims in multiple forums simultaneously—federal court, the FAA, and potentially the DOT’s Rocket Docket. This strategy maximizes the airline’s chances of obtaining relief in at least one forum and creates pressure on the airport to negotiate.

3. Gate Access as Strategic Asset: The case underscores that gate access at constrained airports is a key competitive asset. Gate allocation decisions directly affect airlines’ ability to serve markets and compete effectively.

4. Pre-Development Commitments: The “bait-and-switch” allegation raises important questions about what representations airports make to airlines during the planning phase of new facilities and whether those representations create enforceable obligations.

X. Synthesis: Why Airlines Sue and What It Means for Airport Ratemaking

A. Why Airlines Challenge Airport Rates

Across five decades of litigation, airlines have challenged airport rates for a remarkably consistent set of reasons:

1. Cost Burden: Airlines are the primary payors of airport costs. Landing fees, terminal rentals, and other airport charges represent a significant and growing component of airline operating expenses. When airlines perceive that these costs are excessive, arbitrary, or not justified by the services received, they have both the incentive and the financial resources to challenge them.

2. Methodology Disputes: Airlines frequently challenge the methodology by which airports calculate rates. The choice of ratemaking approach—residual vs. compensatory, historical cost vs. fair market value, equalized vs. facility-specific rates—has material financial consequences. Airlines tend to favor methodologies that minimize their cost exposure.

3. Revenue Diversion: Airlines are acutely concerned about revenue diversion—the use of airport-generated revenues for non-airport purposes. Revenue diversion effectively increases airline costs without providing any corresponding benefit to the airline or its passengers.

4. Discrimination: Airlines challenge rates when they believe the rate structure disadvantages them relative to competitors. Discrimination can be overt (different rates for the same service) or structural (a methodology that systematically produces higher costs for certain carriers).

5. Lack of Transparency: Airlines challenge rates when they cannot verify that the rates are based on documented costs and fair allocation principles. Transparency is both a substantive and procedural concern—airlines need sufficient information to evaluate whether rates are reasonable.

6. Capital Program Costs: As airports undertake massive capital programs, airlines face dramatically rising costs. Airlines challenge the allocation of capital costs when they believe the costs are excessive, the facilities are not needed, or the financing structure is unreasonably expensive.

B. What Airlines Seek to Achieve

The relief that airlines seek in rate disputes varies by case but generally falls into several categories:

• Rate Reductions: The most direct remedy—a determination that current rates are unreasonable and must be reduced.

• Methodology Changes: Airlines may seek to change the fundamental approach to rate calculation, such as requiring historical cost rather than fair market value, or requiring revenue sharing credits.

• Transparency Requirements: Airlines may seek orders requiring airports to provide more detailed cost documentation and rate justification.

• Anti-Discrimination Remedies: Airlines may seek adjustments to rate structures that eliminate discriminatory outcomes.

• Prospective Rate Caps: In some cases, airlines seek limitations on future rate increases, particularly in the context of major capital programs.

• Revenue Diversion Remedies: Airlines may seek orders requiring airports to cease diverting airport revenues to non-airport purposes and to rebate improperly diverted amounts.

C. How Airports Respond

Airports typically defend rate challenges on several grounds:

• Methodology Reasonableness: Airports argue that their rate-setting methodology is reasonable, consistent with industry practice, and compliant with federal standards.

• Cost Documentation: Airports present detailed cost studies showing that rates are based on documented costs and fair allocation principles.

• Contractual Authority: Where rates are established through signed airline use agreements, airports argue that airlines consented to the rate methodology and cannot retroactively challenge what they agreed to.

• Regulatory Compliance: Airports argue that their rates comply with the DOT’s Rates and Charges Policy, FAA Grant Assurances, and applicable statutes.

• Financial Self-Sufficiency: Airports invoke Grant Assurance 24’s requirement of financial self-sufficiency to justify rate levels necessary to fund operations and capital programs.

• Management Discretion: Airports assert that rate-setting is a management function requiring broad discretion and that courts and agencies should defer to reasonable business judgments.

D. The Evolving Standards

The cases examined in this guide reveal a gradual evolution in the legal standards governing airport rates:

In the 1970s, the standard was broad and flexible: charges must provide a “fair approximation of use.” By the 1990s, the Supreme Court had clarified that airports need not share non-airline revenues with airlines, while the DOT had established that airfield rates must be based on historical cost. By the 2000s, the DOT was conducting sophisticated analyses of rate methodology and application, distinguishing between sound methodology and discriminatory outcomes. In the 2020s, airlines are pursuing multi-forum strategies, simultaneously litigating in federal court and before the FAA, and challenging not only traditional rate issues but also facility access and gate allocation decisions.

Throughout this evolution, certain principles have remained constant: rates must be reasonable, cost-based, non-discriminatory, and transparent. What has changed is the sophistication with which these principles are applied and the range of issues to which they extend.

XI. Implications for Current Airport Ratemaking Practice

The body of law examined in this guide has direct, practical implications for how airports structure and defend their rates today. For airport finance professionals, the following principles are critical:

A. Rate Base and Cost Recovery

• Airfield rate base must be calculated using historical cost, not fair market value (LAX I, LAX II).

• Imputed interest on historical cost is a permissible capital cost component, even for unfinanced facilities (LAX I).

• Depreciation schedules must be reasonable and consistent with the actual useful lives of airport assets.

• Cost allocation must follow rational, documented principles that allocate costs based on usage, benefit, or functional relationship.

B. Methodology Selection

• Compensatory ratemaking is an acceptable methodology (LAX III) and can be implemented through a unilateral rate resolution.

• Residual ratemaking requires airline consent and cannot be imposed unilaterally (DOT Rates and Charges Policy).

• The choice of methodology has significant financial consequences and should be made with full understanding of its implications for airline costs, airport risk, and revenue retention.

• Hybrid approaches (combining residual and compensatory elements across different cost centers) are common and defensible if properly structured.

C. Rate Structure Design

• Equalized rates across similar facilities are reasonable when facility equivalence and rotation practices justify the approach (MIA).

• Rates need not achieve mathematical precision—a “fair approximation” is sufficient (Evansville).

• However, even sound methodologies must be monitored for discriminatory outcomes in application (LAX III).

• Non-airline revenue sharing is a contractual matter, not a legal requirement (Kent County).

D. Transparency and Documentation

• Rate structures must be transparent, with documented cost allocation methodology and rate justification (EWR).

• Airports bear the burden of proving reasonableness in Section 47129 proceedings (Rocket Docket).

• Insufficient cost documentation is itself a basis for adverse findings.

• Airports should maintain rate studies and be prepared to defend their methodology at every level of detail.

E. Revenue Use

• All airport revenues must be used exclusively for airport purposes (Grant Assurance 25).

• Revenue diversion is subject to active FAA enforcement and can be the basis for rate challenges (EWR).

• Multi-purpose authorities face particular scrutiny regarding the allocation of airport revenues to non-airport activities.

F. Dispute Resolution Strategy

• Airlines may challenge rates in multiple forums: federal court, FAA administrative complaint, and DOT Section 47129 proceedings.

• Each forum has different procedural rules, evidentiary standards, and remedial powers.

• Airports may consider structuring rates to align with DOT's 2013 Policy and FAA Grant Assurances 22–25.

• Contractual protections in airline use agreements can limit (but not eliminate) airlines’ ability to challenge rates.

XII. Conclusion

The legal framework governing U.S. airport rates and charges is the product of five decades of legislative action, regulatory policy development, and judicial and administrative adjudication. From the Supreme Court’s foundational “fair approximation of use” standard in Evansville through the sophisticated methodology-versus-application analysis of LAX III and the modern multi-forum disputes exemplified by Southwest v. San Antonio, the law has evolved to address increasingly complex questions of airport finance and airline-airport relations.

Several themes emerge from this body of law. First, airports possess broad discretion in designing rate structures, but that discretion is bounded by requirements of reasonableness, cost-basis, non-discrimination, and transparency. Second, the specific ratemaking methodology an airport chooses has material financial consequences for airlines, and methodology selection is the single most common subject of rate disputes. Third, the regulatory framework has become more sophisticated since 2013, with the DOT’s Rates and Charges Policy and the Section 47129 Rocket Docket providing detailed guidance and expedited resolution mechanisms. Fourth, airlines have become more strategic in recent years in their approach to rate challenges, pursuing multi-forum litigation strategies that maximize their leverage.

For airport finance professionals, the practical lesson is clear: rates should be defensible. They must be based on documented costs, calculated using a reasonable and transparent methodology, applied without discrimination, and consistent with federal statutory and regulatory requirements. An airport that designs its rate structure with these principles in mind will be well-positioned to defend its rates against any challenge, in any forum.

The cases examined in this guide are not merely historical artifacts—they are the living law that governs every airport rate negotiation, every airline use agreement, every bond document, and every rate dispute in the United States today. Understanding them is for anyone working in airport finance.

Appendix A: Summary Table of Major Cases

The following table summarizes the major cases discussed in this guide, including the forum, prevailing party, and key holding for each. Case names in blue are hyperlinked to the full opinion or decision.

Appendix B: Statutory and Regulatory References

Federal Statutes

• Anti-Head Tax Act, 49 U.S.C. § 40116

• Airport and Airway Improvement Act, 49 U.S.C. § 47107

• Determination of Airport Fee Reasonableness, 49 U.S.C. § 47129

• Passenger Facility Charges, 49 U.S.C. § 40117

• AIR-21 (Wendell H. Ford Aviation Investment and Reform Act)

Regulatory Policies and Guidance

• FAA Policy on Use of Airport Revenue, 64 Fed. Reg. 7696 (Feb. 16, 1999)

• DOT Policy Regarding Airport Rates and Charges, 78 Fed. Reg. 55,330 (Sept. 10, 2013)

• FAA Airport Compliance Manual, Order 5190.6B

• FAA Grant Assurances

Key Cases

• Evansville-Vanderburgh Airport Auth. Dist. v. Delta Air Lines, Inc., 405 U.S. 707 (1972)

• Indianapolis Airport Auth. v. American Airlines, Inc., 733 F.2d 1262 (7th Cir. 1984)

• Northwest Airlines, Inc. v. County of Kent, 510 U.S. 355 (1994)

• LAX I, DOT/OST (1995)

• MIA Terminal Rate Investigation, DOT/OST (1996)

• LAX II, DOT/OST (1997)

• LAX III, DOT/OST (2007)

• United Airlines v. Port Authority of New York and New Jersey (FAA Administrative, 2014–2018)

• Southwest Airlines Co. v. San Antonio Airport Authority (W.D. Tex. 2024; 5th Cir. appeal pending)

Additional Resources

• ACRP Legal Research Digest 21: Airport Rates and Charges Litigation

Changelog

FAA Regulatory Resources

The following FAA resources provide authoritative guidance on airline challenges to airport rates and charges:

• FAA Policy Regarding Airport Rates and Charges — September 10, 2013 policy and all prior versions (2008, 1996)
• Part 16 Decision Database — Formal airline complaints and FAA determinations
• CGL 2024-01: Updated procedures for informal complaints — 14 CFR Part 13 informal complaint procedures (November 22, 2024)

ACRP Research Resources

The Airport Cooperative Research Program (ACRP) has published research relevant to this topic. The following publications provide additional context:

• Legal Research Digest 2 — "Diversion of Airport Revenue" (2008). Provides the foundational legal and theoretical framework for understanding revenue diversion concepts and the statutory limits on how airport revenue may be used.
• Legal Research Digest 1 — "Compilation of Federal and State Airport Revenue Diversion Laws" (2008). Surveys the legal framework governing revenue diversion prohibitions and constraints.
• Report 36 — "Airport/Airline Agreements — Practices and Characteristics" (2010). Addresses rate-setting frameworks and methodologies used to establish reasonableness of airport charges.

Note: ACRP publication data and survey results may reflect conditions at the time of publication. Readers should verify current applicability of specific data points.

Related DWU AI Articles

• Airline Rate Methodologies
• Airport Revenue Diversion
• Grant Assurance Compliance
• T

  ¹ Airport rate-setting mechanisms governed by PSA Section 47107 and 49 CFR Part 1285.
  ² Use agreement templates and dispute procedures documented in ACRP Report 36: Airport/Airline Agreements—Practices and Characteristics.
  

  hree Dimensions of Airport Finance