Airline Operating Leases & Sale-Leaseback Transactions: Structure, Scale, and Implications for Airport Finance
A reference on aircraft leasing mechanics, financial reporting, and strategic implications for airports and aviation finance professionals
Prepared by DWU AI · Reviewed by alternative AI · Human review in progress
An AI Product of DWU Consulting LLC
March 2026
DWU Consulting LLC provides specialized aviation and municipal finance consulting services to airports, airlines, and transportation authorities. This article is produced as part of DWU's research on aviation finance and airport operations.
Scope & Methodology
This article examines operating leases and sale-leaseback transactions in commercial aviation. We cover the structure of these financing mechanisms, current market data from lessor filings and benchmarking sources, accounting treatment under ASC 842 and IFRS 16, and the financial reporting practices of major U.S. carriers. We then explore how airline lease decisions interact with airport financial planning, rate-setting, and credit analysis.
Sources include SEC filings (10-K, 10-Q), lessor earnings reports and fact sheets, aircraft valuation benchmarks, and aviation industry research. All quantitative claims are sourced to first-hand documents or primary data sources.
Bottom Line
Approximately 49% of U.S. airline fleet capacity is leased, not owned. Sale-leaseback (SLB) transactions allow airlines to convert owned or ordered aircraft into cash while preserving operational use. Operating leases appear on the balance sheet (post-ASC 842) as a right-of-use asset and liability, but produce straight-line operating expense rather than interest + depreciation. For airports, airline leasing decisions affect fleet composition, fuel efficiency, passenger capacity per operation, and residual value risk — all of which influence rate revenue projections, credit metrics, and air service planning.
What Aircraft Operating Leases Are
An airline operating lease is a contract under which an airline pays a lessor — such as AerCap or SMBC Aviation Capital — for the right to operate an aircraft for a defined term, after which the aircraft is returned to the lessor. The airline does not acquire ownership of the aircraft at any point during the lease. Dry leases, in which the lessor provides only the aircraft and the airline supplies the crew, maintenance, and insurance, account for the large majority of operating lease structures in commercial aviation.
According to AerCap's Q3 2025 Fact Sheet, approximately 50% of the world's commercial aircraft fleet is leased, and the fleet on operating lease has trebled in the past 20 years. A separate August 2025 industry analysis estimates 13,295 aircraft on lease out of a total fleet of 35,550 — a penetration rate of 37.3% — with the discrepancy reflecting differences in fleet definition and whether stored aircraft are included. In the United States, the leased share of airline fleets is estimated at 49%.
Operating leases for narrowbody and widebody aircraft vary in duration. Air Lease Corporation reported a weighted average remaining lease term of 7.2 years and a weighted average fleet age of 4.6 years across its 489-aircraft owned fleet as of December 31, 2024.
The Lessor Market
DWU calculation from Aerospace Global News data shows the six largest lessors hold approximately 35% of the estimated global leased aircraft fleet. AerCap, SMBC Aviation Capital, and Avolon, the three largest, collectively controlled approximately 30% of the global leased fleet in 2024 based on lessor 2024 annual filings and fact sheets, as detailed in the table below.
| Lessor | Owned Aircraft | Managed Aircraft | Total Fleet | Assets |
|---|---|---|---|---|
| AerCap | 1,515 | 166 | 1,681 | $72B (Q3 2025) |
| SMBC Aviation Capital | 490 | 232 | 722 | $15.9B |
| Avolon | 601 | 36 | 637 | $30.7B |
| BBAM | 560 | — | 560 | $22.9B |
| Air Lease Corporation | 503 | 50 | 553 | $19.5B |
| BOC Aviation | 425 | 17 | 442 | $30.2B |
Source: Aerospace Global News, January 2026 (fleet); AvBench via AviationA2Z, January 2025 (asset values).
AerCap became the largest lessor after acquiring GE Capital Aviation Services (GECAS) in 2021. Over 90% of AerCap's aircraft on order are new-technology narrowbodies. BOC Aviation reported record profits of $924 million in 2024, a 21% increase over 2023, driven by fleet growth and higher lease rates.
Current Lease Rates
Aircraft lease rates are benchmarked by IBA Aero, which publishes monthly rate indices. As of September 2024:
| Aircraft Type | Condition | Monthly Lease Rate |
|---|---|---|
| Airbus A320neo | New | ~$400,000 |
| Boeing 737 MAX 8 | New | ~$400,000 |
| Airbus A321neo | New | ~$460,000 |
| Boeing 737-800 / Airbus A320 | Mid-life | $230,000–$250,000 |
| Boeing 787-9 | New | ~$1,050,000 |
| Airbus A350-900 | New | ~$1,140,000 |
| Boeing 777-300ER | 12 years old | ~$450,000 |
Lease rates for new-generation narrowbody aircraft increased through 2023 and 2024, driven by supply constraints from Boeing's production limitations and the Pratt & Whitney GTF engine inspection campaign, which grounded A320neo-family aircraft and forced operators to extend existing leases rather than return aircraft to the market. Aircraft production in 2024 was just over 1,100 units, representing a 31% shortfall from the 2018–2019 production average of 1,600 units (Airbus and Boeing annual reports, 2024).