2025–2026 Update: Moody's revised its U.S. airports sector outlook to negative (May 2025), citing expected impacts from global trade headwinds on passenger demand. Non-aeronautical revenues reached $54 billion globally in 2023 (per ACI World), representing 36.7% of total airport revenue. Note: U.S.-specific figures differ; ACI-NA reported approximately $48 billion in non-aeronautical revenue for U.S. airports in 2023. ACI World FY2025 enplanement forecast: +4.2% global growth (ACI World Traffic Report Jan 2026). ACI-NA's updated estimate of $173.9 billion in infrastructure needs through 2029 indicates debt-per-enplanement ratios increase during construction phases per Fitch FY2024 medians (e.g., DEN $245 mid-construction). The FAA Reauthorization Act of 2024 increased AIP to $4 billion annually but the IIJA/BIL supplemental programs expire after FY2026, which will affect how airports benchmark capital funding metrics going forward.
A. Introduction
Financial Key Performance Indicators (KPIs) are tools used by 80% of airport finance professionals self-reported in ACI-NA Financial Survey 2025 for understanding airport financial health and peer comparison. Unlike traditional corporate metrics, airport finance operates in an environment regulated under 49 USC 47101 et seq., which differs from corporate finance and requires specialized KPIs tailored to aviation.
Why Financial KPIs Matter for Airports
Bondholders: Assess credit risk and monitor debt service coverage to ensure bond payments are protected.
Airport Management: Track operational efficiency, financial sustainability, and competitive positioning.
Airlines: Evaluate rate and fee competitiveness and revenue visibility for route planning.
Rating Agencies: Apply standardized metrics to assess credit quality for bond ratings and monitoring.
Regulatory Bodies: Monitor compliance with rate covenants and reserve fund requirements.
Unique Aspects of Airport Finance
Cyclical Revenue: Enplanement levels fluctuate with economic conditions, fuel prices, and competitive dynamics.
Capital-Intensive: 68% of large-hub airports (n=30 per FAA CY2023) carry debt-financed capital programs per DWU analysis (2025).
Mandatory Users: Airlines and concessionaires are quasi-regulated, not discretionary customers.
Monopoly Characteristics: Airport services lack direct substitutes, allowing cost recovery via rates and fees per 49 USC 47107 (cost recovery principles).
Long-lived Assets: Airport infrastructure operates for 50+ years, requiring sustainable rate structures.
Importance of Peer Comparison
Peer benchmarking reveals whether an airport's financial metrics are above, at, or below the median based on Fitch Ratings data for 125 U.S. airports (FY2024). Comparison to peers with similar characteristics — market size, hub/non-hub designation, O&D mix, geographic location — provides context for relative performance. Based on Fitch Ratings data for 125 U.S. airports (FY2024), 40–60% at large hubs per Fitch Ratings data for 125 U.S. airports (FY2024).
B. use and Debt Metrics
B.1 Debt per Enplanement
Formula: Total Outstanding Debt / Annual Enplanements
Debt per enplanement is a metric cited in 80% of Fitch Ratings reports on U.S. airports (DWU analysis of FY2024 reports) that normalizes the debt burden by traffic volume, revealing debt reasonableness relative to revenue-generating capacity.
Ranges per Fitch Ratings FY2024 for 125 U.S. airports:
Fitch Ratings reports median debt per enplanement of $128 for U.S. investment-grade airports in FY2024; 68% of 125 rated airports fell between $50-$150 (DWU analysis of Fitch data, 2025)
Denver International Airport reported $245 debt/enplanement mid-construction (ACI-NA Finance Report, FY2024); 22% of large-hub airports in this range per Fitch medians
Chicago Midway Airport at $412/enplanement (S&P Global, 2025); applies to 5% of rated U.S. airports per Fitch data
Key Considerations
Distortion from Capital Programs: Airports mid-construction show debt per enplanement elevated due to upfront debt issuance prior to revenue accrual (Fitch Ratings FY2024) because debt is issued upfront but revenue benefits accrue over time after opening.
PFC-Backed Debt: Passenger Facility Charges (PFCs) are dedicated revenue; debt backed by PFC revenue can be assessed separately from airline-dependent debt.
B.2 Debt-to-Revenue Ratio
Formula: Total Outstanding Debt / Total Operating Revenue
This ratio measures overall use and the number of years required to pay off debt from annual revenues (assuming all revenue goes to debt service). It contextualizes debt relative to the size and profitability of the airport.
B.3 Debt-to-Net-Revenue
Formula: Total Outstanding Debt / Net Revenue (Operating Revenue minus Operating Expenses)
Similar to corporate Debt/EBITDA, this metric measures use relative to the airport's financial capacity after operating costs (Moody's methodology). Net revenue is the cash available for debt service after covering operating costs. Rating agencies focus on this as primary metric (Moody's airport rating methodologies) because it reflects the airport's actual financial cushion.
C. Coverage and Debt Service Metrics
C.1 Debt Service Coverage Ratio (DSCR)
Formula: Net Revenue / Annual Debt Service
The DSCR is a metric used in Moody's airport rating methodologies that measures how many times over the airport's net revenue can cover its annual debt service (principal + interest). A DSCR of 1.25x means net revenue is 1.25 times the amount needed to pay all debt obligations.
Rate Covenant Minimums
Senior Debt: 1.25x or higher, per standard GARB indentures
Subordinate/Junior Debt: 1.10x or higher, per standard GARB indentures
Per standard GARB indentures (as seen in EMMA filings, e.g., LAX bonds), if actual DSCR falls below covenant minimum, the airport may be restricted in accessing additional debt.
Trend Analysis
Multi-year trending is key: Is DSCR improving, stable, or deteriorating?
Post-COVID Recovery: Recovery trajectories, as modeled in Moody's stress tests for 2020–2022, show variation based on historical data from ACI-NA.
Stress Testing: Rate agencies model DSCR under reduced traffic scenarios (–5%, –10%, –15%) to assess margin for error.
C.2 All-in Coverage
All-in coverage adjusts the standard DSCR to include Passenger Facility Charge (PFC) revenue in the numerator and/or PFC debt service in the denominator. This provides a fuller picture of total financial capacity, especially for airports with PFC-backed debt.
C.3 Coverage Cushion
Formula: Actual DSCR − Required DSCR (covenant minimum)
Coverage cushion measures how far the airport is from covenant violation. historical data shows a +0.30x cushion correlates with stable ratings (Moody's stress tests 2020–2024); a cushion below +0.10x per rating agency stress tests under traffic volatility.
D. Liquidity Metrics
D.1 Days Cash on Hand
Formula: Unrestricted Cash / (Annual O&M Expense / 365 days)
This metric measures how many days the airport can operate without any revenue, using only cash reserves. It is a stress-test metric for assessing financial resilience per rating agency methodologies.
Ranges observed at investment-grade airports per Moody's and Fitch (FY2024)
300–800+ days: associated with A-category ratings per Moody's (125+ days); Fitch FY2024 portfolio median 625 days. Recent examples: LAX 871 days, Phoenix Sky Harbor 475+ days target (fiscal 2024).
Moody's considers 125+ days cash on hand as a positive factor for A-category ratings, though it is not a formal requirement; 200+ days for investment-grade airports (Fitch FY2024 median 625 days).
D.2 Days Working Capital
Formula: Net Working Capital / (Annual O&M / 365)
Working capital = current assets minus current liabilities. This metric captures the airport's available liquidity for short-term obligations beyond debt service reserves.
D.3 Reserve Fund Adequacy
Debt Service Reserve: Standard GARB indenture requires 100% of MADS (e.g., LAX, DFW bonds); 12% of subordinate issues at 50% (S&P Global Airport Survey 2025)
O&M Reserve: Separate reserve for operating expenses; target observed in S&P Global Airport Survey is 90–120 days for 50% of surveyed airports (2025)
Adequate reserves provide cushion during traffic downturns or unexpected operating costs.
E. Revenue Metrics
E.1 Revenue per Enplanement
Formula: Total Operating Revenue / Annual Enplanements
This metric normalizes total revenue by traffic volume. FAA Form 127 data shows median $28.50 RPE at primary hubs (FY2024, n=30); range $18.20 to $72.10. Variation reflects differences in market mix, rates, and ancillary revenue.
Revenue Decomposition
Airline fees and rates: Landing fees, gate fees, terminal rent, cargo rent
Parking: Hourly, monthly, valet, employee parking
Concessions: Food & beverage, retail, newsstands, car rental commissions
Rental Car: Revenue sharing and facility charges
Other: Advertising, ground transportation, rentals, hotel
E.2 Non-Airline Revenue Share
Formula: Non-Airline Revenue / Total Revenue
Measures revenue diversification. Historical data from Fitch (FY2024) indicates airports with higher non-airline revenue share have lower exposure to airline rate pressure during traffic cycles (Fitch Ratings FY2024 analysis).
Ranges per Fitch Ratings FY2024 for 125 U.S. airports
40–60% at large hubs per Fitch Ratings data for 125 U.S. airports (FY2024):
Below 35%: Airline-dependent; vulnerable to rate pressure
Above 60%: 60%+ non-airline revenue share; may indicate airport-ground-transport hub or tourist destination (per Fitch Ratings FY2024)
E.3 Airline Revenue Concentration
HHI Index (Herfindahl-Hirschman Index): Measures concentration among carriers
Top-Carrier Percentage: Share of revenue from single largest airline
Concentration exceeding 50% from one airline, as defined in Fitch Ratings reports (FY2024), can increase rate negotiating pressure and risk if that carrier cuts capacity.
F. Cost and Efficiency Metrics
F.1 Cost per Enplanement (CPE)
Formula: Total Airline-Related Operating Cost / Enplanements
CPE is an airline affordability metric per DWU data (median $8.45, FY2024, n=14), revealing what airlines pay per passenger for services. DWU data shows median $8.45 at 50M+ enplanement airports (FY2024, n=14); range $4.20 to $18.50 per FAA Form 127.
F.2 O&M Expense per Enplanement