Airport Capital Planning Under Funding Constraints: Integrating PFC, AIP, CFC, and Debt in a Post-IIJA World

I. Capital Funding Gap Assessment

The Dollar Magnitude

The Airports Council International - North America (ACI-NA) estimated that U.S. commercial airports require $173.9 billion in capital investment over the 2025–2029 planning period to maintain current service levels, accommodate anticipated growth, and meet terminal modernization and ground access standards. This represents a $35 billion increase from the 2020 ACI-NA study, driven by deferred maintenance backlog, post-pandemic technology upgrades, regulatory compliance (TSA infrastructure, sustainable aviation fuel readiness), and climate resilience.

Of this $173.9 billion need:

• Federal AIP and discretionary grants: Estimated $10–14 billion annually, depending on congressional appropriations
• PFC revenue: Locked at $4.50 cap since 2000, generating $3.7 billion nationally per year, or $18.5 billion over five years—but only for projects meeting eligibility rules
• Commercial revenue, state/local grants, and private investment: Approximately 10–12% of total capital need
• Remaining gap: Estimated $80–140 billion over five years, typically funded through tax-exempt revenue bonds, airline rates (pay-go), and private activity bond structures

The IIJA/BIL Cliff

The Infrastructure Investment and Jobs Act (IIJA, called the "Bipartisan Infrastructure Law") injected federal funding into airports between 2022 and 2026. The IIJA (also referred to as the Bipartisan Infrastructure Law) provided supplemental airport funding through programs including the Airport Improvement Grant (AIG) program (~$2.9 billion per year, ~$14.5 billion total over five years) and Airport Terminal Program (ATP, ~$1 billion per year, ~$5 billion total over five years). These programs created a period of elevated federal funding that accelerated capital projects and deferred the need for local debt.

This ends in fiscal year 2026. After 2026, federal appropriations for airports revert to historical baseline levels of approximately $3.2–3.5 billion annually, creating a funding cliff that coincides with rising debt service obligations from projects financed during high-spending years. Airports that used IIJA funding to accelerate capital execution now face a strategic transition: they will rely on PFC, bonds, and pay-go sources to fund future capital while servicing debt from IIJA-accelerated projects.

Rate Stability and Airline Cost Impact

Every dollar of capital funded by revenue bonds instead of grants adds to long-term debt service and increases airline cost per enplanement (CPE). Under a residual rate-setting methodology (used at a majority of the 31 large-hub airports), airlines collectively pay rates designed to recover all airport costs. Under the bond trust indenture, debt service is typically the first claim on pledged net revenues. Integrated funding approaches can reduce CPE growth during the post-IIJA transition compared to all-bond financing.

II. Five Funding Sources, Five Sets of Rules: A Taxonomy

AIP (Airport Improvement Program)

Legal basis: 49 U.S.C. § 47101–47175; administered by FAA Office of Airports.

Federal Share and Entitlements:

• Large hub airports: 75% federal / 25% local match; $22 million entitlement per year (indexed)
• Medium hub: 75% federal / 25% local match; $10 million per year
• Small hub: 90% federal / 10% match; $3.25 million per year
• Non-hub: 90% federal / 10% match; $150,000 per year
• Entitlements may be obligated within three fiscal years or are forfeited

Eligible Projects: Runway and taxiway improvements, terminal expansion/renovation (when supporting air service), ground access, parking, safety/environmental improvements, equipment and technology (baggage systems, IT infrastructure). Full eligibility guidance in FAA AC 150/5100-14D.

Ineligible Projects: Commercial concessions (retail, F&B), hotels, parking garages (unless ground access component), off-airport roads/transit, airline or handler tenant improvements.

Key Compliance: Grant assurances bind the airport for useful life of project (25–40 years, per Order 5100.38D); Davis-Bacon prevailing wage applies; NEPA environmental review required; FAA approval of engineering plans before bidding.

TSA and DHS Cybersecurity Grants

Legal basis: TSA Security Directives and DHS CISA grant programs for key infrastructure protection.

As TSA cybersecurity mandates expand, airports face new capital and operating costs for network segmentation, monitoring systems, and staffing. While TSA mandates are largely unfunded, several federal grant programs can partially offset compliance costs. DHS CISA's State and Local Cybersecurity Grant Program (SLCGP), authorized under the IIJA, provides funding to state and local governments—including airport authorities—for cybersecurity planning and implementation. Airports may benefit from coordinating with their state administrative agencies to access these funds. Additionally, some AIP-eligible technology and infrastructure projects may overlap with cybersecurity requirements, allowing airports to use AIP entitlements for dual-purpose investments (e.g., network infrastructure upgrades that also achieve TSA segmentation requirements).

PFC (Passenger Facility Charge)

Legal basis: 49 U.S.C. § 40117; administered by FAA PFC Program and DOT Office of Inspector General for audit.

Charge Cap: $4.50 per enplanement, frozen since AIR-21 (2000). In inflation-adjusted 2026 dollars, this cap would be equivalent to approximately $8.00–$9.50.

Annual Revenue Potential: A large-hub airport with 20 million annual enplanements generates $90 million per year at $4.50. National aggregate: approximately $3.7 billion annually across all U.S. airports.

Eligible Uses: Terminal expansion, renovation, modernization; ground access improvements; debt service on eligible project bonds; intermodal connections; technology upgrades supporting passenger operations.

Ineligible Uses: Runways/taxiways (AIP-only); hangars/maintenance facilities; airline/handler-specific facilities; debt service on ineligible projects; operational expense.

Recent Legislative Change—PL 118-63 (2024): Section 713 of the FAA Reauthorization Act of 2024 reduced the large hub AIP entitlement penalty for high-PFC airports from 75% to 60%, effective May 16, 2024. This change provides approximately $100 million in additional AIP funding annually for large hub airports while leaving the $4.50 cap unchanged, preserving the underlying tension between PFC use and federal grant maximization.

CFC (Customer Facility Charge)

Legal basis: State enabling legislation (varies by jurisdiction); governed by airport concession policy and ConRAC master agreements. Federal revenue-use requirements under 49 U.S.C. § 47107 apply to CFC revenue at airports receiving AIP grants.

Charge Cap: No federal cap (unlike PFC). Rates are set by competitive bidding, with 2025 CFC rates ranging from $3–$8 per transaction at surveyed large and medium-hub airports.

Eligible Use: Rental car facilities only—off-terminal facilities, shuttle parking, consolidated rental car facilities (ConRACs).

Revenue Potential: Varies by airport size and transaction volume; $3–15 million annually at surveyed medium-hub and larger airports (per airport official statements and ACFR filings).

Financial Structure: CFC-backed revenue bonds are used for ConRAC development at many large and medium-hub airports. Bonds are repaid first from CFC collections, then from parking revenue if co-located. CFC bonds isolate rental car costs from aeronautical rates, which is key for fairness and credit evaluation.

TIFIA (Transportation Infrastructure Finance and Innovation Act)

Legal basis: Infrastructure Investment and Jobs Act (BIL), Section 11101; administered by the U.S. Department of Transportation Build America Bureau in coordination with the FAA.

Program Overview: TIFIA is a federal credit program (loans, not grants) that provides low-cost financing to transportation projects. The program was first authorized in 1998 but was limited to highways, transit, and rail until the 2021 BIL expansion. Section 11101 of BIL extended TIFIA eligibility to airports for the first time, creating a new capital tool for airport infrastructure financing.

Eligible Projects: Terminal buildings, airfield infrastructure (runways, taxiways, aprons), airport entrance roads and ground access, land acquisition, aircraft rescue and firefighting (ARFF) facilities, and people movers or intermodal connections. Projects must demonstrate creditworthiness and supportable revenue streams.

Loan Structure: TIFIA loans carry an interest rate equal to the Treasury rate (market rate of U.S. Treasury debt of similar maturity), making them cheaper than tax-exempt municipal bonds. For rural airports, the rate is capped at half the Treasury rate. Loans can cover up to 49% of eligible project costs, which is the statutory maximum. This ceiling was administratively capped at 33% until July 2025, when Secretary of Transportation Sean Duffy removed the administrative cap, allowing airports to access the full 49% statutory limit for the first time.

Capital Stack Position: TIFIA loans are structured as subordinate (junior) liens, sitting below senior-lien revenue bonds and airport revenue bonds (GARBs) in the flow of funds. This subordination means TIFIA does not trigger the Alternative Minimum Tax (AMT) provisions that apply to senior bonds, preserving the airport's tax-exempt borrowing capacity for senior debt. A typical capital stack for a large project would rank debt in this order: (1) Senior GARBs, (2) Subordinate GARBs, (3) TIFIA loans, (4) PFC revenue (passenger-backed, non-debt), (5) Federal grants, (6) Pay-go.

Key Program Features: Loan terms in practice extend 20–35 years with patient capital structure; there is no investment-grade credit rating requirement (making TIFIA available to airports that may not qualify for rated municipal bonds); subordination to senior debt is accepted by rating agencies and senior bondholders; and the program is designed for capital-intensive projects with long useful lives and stable revenue streams.

Application and Timeline: Airports submit Letters of Intent (LOI) to the Build America Bureau following annual funding notices. The most recent LOI deadline was September 30, 2025. As of December 2025, approximately 37 airport projects have submitted LOIs for TIFIA financing, with requested loan amounts ranging from $5 million to $666 million (JFK Modernization and Expansion Program). The first airport TIFIA loan closed in January 2025 for the Skybridge people mover project, which will connect the terminal to a new remote parking facility.

Legislative Uncertainty and H.R. 6168: The current TIFIA authorization for airports expires with the September 30, 2025 LOI window. No new applications can be submitted unless Congress reauthorizes the program or passes new legislation. H.R. 6168 (the "Airport TIFIA Financing Certainty Act"), supported by ACI-NA, would make airport TIFIA permanent, remove the investment-grade requirement, and allow master credit agreements for multi-phase projects. As of early 2026, H.R. 6168 has not advanced in Congress, creating uncertainty for airports planning large capital programs.

Financial Impact: For a $100 million capital project, TIFIA financing (49% = $49 million at Treasury rate ~4.5%) generates savings of approximately 0.5–1.0% on blended interest costs compared to all-municipal-bond financing. Additionally, because TIFIA is subordinated, it preserves the airport's capacity to issue senior-lien bonds for additional capital, whereas equal senior debt would crowd out future borrowing capacity.

Revenue Bonds (Tax-Exempt under IRC § 142)

Structure: Airport issues bonds backed by pledge of revenues (in practice net revenues after operating expense). Pledged revenues defined in indenture: may include airline rents, landing fees, concession revenue, PFC, and CFC. Bonds carry credit ratings (S&P, Moody's, Fitch) based on airport financial position and revenue pledge. Interest is tax-exempt for federal income tax purposes under IRC § 142.

Key Financial Covenants:

• Debt Service Coverage Ratio (DSCR): 1.25× to 1.50× (per EMMA municipal bond filings); net revenues must equal 1.25–1.50 times annual debt service
• Revenues Available for Debt Service (RADS): defined narrowly to ensure predictable coverage
• Rate Covenant: airport may establish rates sufficient to meet all revenue requirements, including debt service, operating reserves, and Debt Service Reserve Fund (typically one year of debt service per revenue bond prospectuses)

Cost of Capital (2026): AAA-rated 30-year bonds yielding 3.5–4.0%; BBB-rated bonds yielding 5.5–6.5% (based on MSRB 2026 market data). All-in cost of a $100 million bond issue includes underwriting fees (0.5–1.5%), legal fees, and rating agency costs—2–3% of proceeds (per competitive bidding data).

Residual vs. Compensatory Pledge: Residual rate-setting methodology is used at many large-hub airports and means airlines collectively pay rates designed to recover all airport costs after commercial revenue credits. Separately, under the bond trust indenture, debt service is typically the first claim on pledged net revenues. Compensatory methodology is used at airports of all sizes, including several large hubs, and means the airport sets airline rates—typically terminal rent per square foot and landing fees per unit of landed weight—based on allocated costs, with the airport bearing the revenue risk. The choice of methodology affects rate volatility and financial flexibility.

Pay-Go (Appropriation from Current Revenue)

Structure: Airport funds capital projects from cash flow generated in the current year or prior years. No debt service obligation, no interest cost, no coverage requirement.

Advantages: No debt; lowest financial cost among funding sources; preserves debt capacity for larger projects. At compensatory airports, pay-go preserves DSCR by reducing debt service obligations. At residual airports, where DSCR is mechanically predetermined by the rate formula, pay-go instead reduces airline rates. Improves liquidity ratios at all airports.

Disadvantages: Reduces current-year cash available for operations or reserves; may spike airline rates in year of large capital outlay (unless smoothed via reserves); less efficient for large multi-year capital programs requiring >$50 million annually.