Aircraft Lease Structures in Asian Regional Aviation: A Practitioner's Overview

Most aircraft flying commercially today are not owned by the airline operating them. The global commercial fleet has shifted progressively toward leased ownership over the past three decades, with industry sources commonly citing figures above 40% of commercial aircraft worldwide as leased rather than owned. In Asia-Pacific specifically, which Technavio identifies as the fastest-growing region for aircraft leasing with a forecast 41% growth rate, the leasing model is even more central to fleet strategy. Low-cost carriers in the region are essentially built on the assumption of lease-based financing, and even full-service carriers increasingly use leases to manage capital, smooth fleet renewals, and respond to demand cycles.

For practitioners working in fleet planning, finance, or operations at a regional carrier, understanding lease structures is no longer optional. The structure of an aircraft lease determines who owns the asset, who pays for what, who is liable in what circumstances, who is responsible for safety oversight, and ultimately how the operator’s network strategy can flex. This article walks through the main lease structures used in Asian regional aviation, their commercial and regulatory implications, and the trade-offs that determine which structure fits which use case.

1. The two fundamental questions

Every aircraft lease answers two questions. First, who has financial ownership of the aircraft asset? Second, who has operational responsibility for flying it?

The first question separates operating leases from finance leases. In an operating lease, the lessor retains ownership of the aircraft, the lessee pays rent for use, and the aircraft returns to the lessor at the end of the lease term. In a finance lease (also called capital lease), the structure effectively transfers ownership economics to the lessee, with the asset appearing on the lessee’s balance sheet and the lessee bearing most of the residual value risk. Operating leases dominate the commercial market today, partly because of the flexibility they offer airlines and partly because of accounting treatment that, until recent IFRS 16 changes, kept lease obligations off-balance-sheet.

The second question separates dry leases from wet leases. In a dry lease, the lessor provides only the aircraft itself; the lessee provides crew, maintenance, insurance, and operates the aircraft under its own Air Operator Certificate. In a wet lease, the lessor provides the aircraft together with crew, maintenance, and insurance, and the aircraft typically operates under the lessor’s AOC. Between these two pure forms sit several intermediate arrangements.

The combination of these two dimensions produces the lease structure landscape. An aircraft can be on a dry operating lease (the most common configuration in commercial aviation), a dry finance lease (closer to ownership), or various forms of wet lease (used for specific operational needs rather than as a primary fleet strategy).

2. Dry lease: the workhorse structure

The dry operating lease is the dominant form of commercial aircraft financing in Asian regional aviation, as it is globally. The mechanics are straightforward: a lessor (typically one of the major lessors such as AerCap, SMBC Aviation Capital, Avolon, Air Lease Corporation, or BOC Aviation) owns the aircraft; the airline lessee pays monthly rent for use; the lease term typically runs 6 to 12 years for new-build aircraft; and the aircraft returns to the lessor at end of lease in agreed condition (with return conditions one of the most negotiated parts of any lease).

The lessor’s role is purely financial. The aircraft is registered in the airline’s home country (or in a leasing-friendly jurisdiction such as Ireland, Bermuda, or Cayman Islands with appropriate Article 83bis arrangements). The airline operates the aircraft under its own AOC, with its own crew, its own maintenance programme, its own insurance, and its own operational responsibility. From a passenger’s perspective, the aircraft is indistinguishable from an owned aircraft; from a regulator’s perspective, the airline bears the same operational responsibilities as if it owned the aircraft outright.

The strategic logic for using operating dry leases is well-established:

Capital preservation. A new A320neo or 737 MAX list-priced around $110-130 million is a major capital commitment. Leasing converts that purchase into a monthly rental obligation, freeing capital for other uses (working capital, network expansion, IT investment).

Fleet flexibility. Lease terms of 6-12 years allow the operator to adjust fleet composition as market conditions and aircraft technology evolve, without bearing residual value risk on aircraft that may become obsolete.

Risk transfer. The lessor bears the residual value risk; if the aircraft is worth less than expected at lease end, the loss is the lessor’s. The airline simply returns the aircraft.

Network reach without ownership. A new entrant carrier can build a fleet of 10-20 aircraft entirely through leases, without the capital base that ownership would require. This is the foundation of how AirAsia, VietJet, Lion Air, Cebu Pacific, and other Asian LCCs grew at scale.

The lessor side of this equation has consolidated dramatically over the past decade. By 2026, the global aircraft leasing market exceeded $200 billion in size (with various industry research firms placing it between $208 and $237 billion depending on methodology), reflecting both ongoing fleet growth and the continued structural shift from ownership toward leasing. Approximately 53% of the global commercial fleet is now leased rather than owned, up from around 22% in 2000, with operating leases dominating at roughly 72% of active lease contracts. Over 680 airlines worldwide now rely on lease arrangements as a primary fleet financing tool. AerCap remained the dominant individual lessor with a fleet of approximately 1,676 aircraft (valued near $62 billion), more than double the size of its next-largest competitor. SMBC Aviation Capital held approximately 761 aircraft, with Avolon at around 583 aircraft and BBAM managing approximately 560 aircraft (over $21 billion in assets under management). The top 10 lessors collectively control roughly 60% of the global leased fleet, with the remainder distributed across BBAM, Aviation Capital Group, DAE Capital, ICBC Leasing, CDB Aviation, Nordic Aviation Capital, Macquarie AirFinance, Aircastle, and dozens of smaller lessors. Low-cost carriers now represent approximately 30-35% of lessor portfolios industry-wide, reflecting the structural shift toward asset-light operating models in regional aviation globally. The continued momentum behind this model is reflected in major new commitments such as AirAsia’s July 2025 deal with Airbus for 50 A321XLR aircraft (plus 20 options) worth $12.25 billion, positioning the carrier as the world’s first low-cost narrow-body network operator.

3. Sale-leaseback: turning an owned aircraft into a leased one

A specific variant of the dry operating lease that has become central to Asian regional fleet strategy is the sale-leaseback transaction. In a sale-leaseback, the airline orders an aircraft from the manufacturer, takes delivery, and immediately sells the aircraft to a lessor, then leases the same aircraft back from that lessor for ongoing operation. The aircraft never leaves the operator’s hands operationally; only the legal ownership transfers.

The economic mechanism is worth understanding because it is genuinely clever. Airlines often place large aircraft orders years in advance and negotiate substantial discounts off manufacturer list prices. By the time the aircraft is delivered, its market value may approximate the list price rather than the discounted purchase price. The airline can sell the delivered aircraft to a lessor at near-market value, realising a cash gain over its actual purchase price, while continuing to operate the aircraft under the leaseback. The net effect is that the airline monetises the value embedded in its order book at the moment of delivery, while preserving its operational fleet plan.

This mechanism has driven several large transactions in Asian regional aviation:

• AirAsia sold its aircraft leasing subsidiary Asia Aviation Capital to BBAM in 2018 for approximately $1.18 billion, in a transaction that effectively converted years of accumulated favourable order pricing into immediate cash. AirAsia has since continued sale-leaseback transactions on individual aircraft and engine pools, including a 2018 transaction with Castlelake covering 79 aircraft and 14 engines for RM4.38 billion (approximately $1.05 billion at the time).

• Thai AirAsia (operated by Asia Aviation Public Company Limited) executed a 2022 sale-leaseback transaction with Sky Aero Management covering 4 aircraft, generating approximately THB 1.69 billion in working capital after loan repayment.

• Vietnam Airlines executed its first sale-leaseback transaction in 2017, covering three A350-900 aircraft delivered through Dubai Aerospace Enterprise (DAE).

• VietJet signed a 2024 MoU with Irish lessor Castlelake covering financing for four A321neo aircraft valued at $560 million.

The sale-leaseback model has become so embedded in LCC fleet strategy that the term “asset-light business model” is now standard industry vocabulary for operators that own few or no aircraft outright. The model has trade-offs: the airline pays ongoing lease rent rather than owning the asset outright, and at lease end the aircraft returns to the lessor rather than being available for continued use without renewal. But for capital-constrained operators in fast-growing markets, those trade-offs are usually worth it.

4. Article 83bis: when registration follows finance

A complication arises when an aircraft’s legal registration and its operational base are in different countries. Many lessors prefer to register their aircraft in jurisdictions with favourable legal, tax, and aviation regulatory frameworks: Ireland, Bermuda, Cayman Islands, and Malta are common choices. The airline operating the aircraft, however, may be based in a completely different country with its own civil aviation regulator.

The default rule under the Chicago Convention is that the State of Registry is responsible for the aircraft’s airworthiness and operational oversight, regardless of where the aircraft is operated. This creates a practical problem: an aircraft registered in Ireland but operated daily in Vietnam cannot realistically be inspected and overseen by the Irish Aviation Authority on an operational basis. The aircraft is physically in Vietnam.

Article 83bis of the Chicago Convention solves this problem. Adopted as an amendment to the Convention, Article 83bis allows the State of Registry to transfer specific functions and duties to the State of the Operator through a formal bilateral agreement. The articles of the Convention that can be transferred under Article 83bis are:

• Article 12 (Rules of the Air)
• Article 30 (Radio Licensing)
• Article 31 (Certificate of Airworthiness)
• Article 32(a) (Flight Crew Licences)

The mechanism requires four steps in practice. First, the State of Registry (typically through its civil aviation authority) audits the State of the Operator to confirm it has the capacity, capability, and competence to undertake the transferred oversight functions. Second, the two states enter into a formal Article 83bis agreement specifying exactly which functions are transferred. Third, the agreement must be registered with ICAO to be legally effective against third-party states. Fourth, the operator obtains the necessary authorisations under the State of the Operator’s regulatory framework to actually operate the aircraft.

For Asian regional carriers leasing aircraft from Irish or Bermudian-registered lessors (a common configuration), Article 83bis arrangements are routine. The aircraft remains legally Irish or Bermudian registered (preserving the lessor’s legal protections and tax structure), but the operating state’s civil aviation authority handles day-to-day oversight. This is the mechanism that makes cross-border leasing operationally workable.

The practical implications for the lessee airline are significant. The airline’s FAOC application (covered in an earlier post) must address the Article 83bis arrangement explicitly. The maintenance programme must reference both the State of Registry and the State of the Operator requirements where they differ. The airworthiness certificate is issued by the State of Registry but with operational oversight by the State of the Operator. And in the event of a serious incident, the legal framework requires both states to be notified.

5. Wet lease, damp lease, and ACMI variants

Between the pure dry lease (airline operates with own crew under own AOC) and full charter operation (lessor operates with own crew under lessor’s AOC), several intermediate structures exist. The terminology varies somewhat by jurisdiction, but the most common variants:

Wet lease. The lessor provides Aircraft, Crew, Maintenance, and Insurance (ACMI). The lessor typically operates under its own AOC, with the lessee paying a block-hour rate that includes all four elements. Wet leases are most commonly used for short-term capacity needs (covering a temporary aircraft shortage, supporting a seasonal peak such as the Hajj, or operating a new route until owned/dry-leased capacity arrives).

Damp lease. The lessor provides Aircraft, Crew, and Maintenance, but the lessee provides Insurance and certain other services. Damp leases are less common than full wet leases and are sometimes used in specific regulatory environments where the lessee airline needs to maintain certain operational responsibilities for regulatory reasons.

ACMI lease. In some jurisdictions the term ACMI is used interchangeably with wet lease; in others ACMI implies a slightly different regulatory configuration. The practical content (aircraft + crew + maintenance + insurance) is the same.

Wet/ACMI leases in Asian regional aviation are typically used for:

Peak season capacity. Carriers experiencing seasonal demand spikes (Lunar New Year, Hajj season, summer holiday peaks) sometimes wet-lease additional aircraft for the peak period, returning them when demand normalises.

Bridging delivery delays. When ordered aircraft are delayed (a recurring issue with Boeing 737 MAX and Airbus A321neo deliveries through 2022-2025), operators have wet-leased substitute capacity to maintain planned schedules.

New route trials. A carrier launching a new route may wet-lease an aircraft for the first few months while it determines whether to commit dry-lease or owned capacity to the route long-term.

Crisis recovery. Following operational disruptions (a fleet grounding due to safety concern, a major incident affecting fleet availability), wet leases provide rapid replacement capacity.

The wet lease market has its own ecosystem of specialised operators. In Asia-Pacific, companies including Hi Fly (Portugal-based but with Asian operations), SmartLynx, Avion Express, and various regional ACMI providers operate fleets specifically configured for wet-lease deployment. The next post in this series will cover wet-lease and ACMI operations specifically in more detail.

6. The lessor’s perspective

Understanding lease structures from the airline’s perspective is one half of the picture. Understanding them from the lessor’s perspective is the other half, and matters because lessor behaviour shapes what terms airlines can actually negotiate.

The lessor’s economic model is fundamentally that of an asset financier with operational risk. The lessor purchases or finances the aircraft, leases it to an airline, collects monthly rent that combines an interest-rate-equivalent return plus depreciation cover, and bears the risk that at lease end the aircraft is worth less than expected. Lessors mitigate this risk through several mechanisms:

Strict return conditions. The lease specifies the technical and cosmetic condition in which the aircraft must be returned (engine cycle counts, airframe age, paint, interior). Return conditions are heavily negotiated and represent significant value transfer between lessor and lessee.

Maintenance reserves. The lessee pays monthly amounts into a reserve fund that the lessor draws on to pay for major maintenance events (engine overhauls, landing gear refurbishments, C-checks). This protects the lessor from a scenario where the lessee defers maintenance and returns an aircraft requiring expensive work.

Lease end remarketing. Lessors maintain commercial teams whose function is to find new lessees for aircraft returning from lease, often before the current lease ends. The remarketing risk is the lessor’s, and managing it is a core competence.

Repossession rights. The lease contract includes detailed provisions for the lessor to repossess the aircraft in the event of lessee default. Article 83bis arrangements complicate repossession in cross-border lease structures, and lessors are increasingly attentive to the legal certainty of repossession in different jurisdictions before extending lease terms.

The implication for airlines is that lease negotiations are not just about monthly rent. Return conditions, maintenance reserves, lease term flexibility, and repossession provisions all matter, and the airline that focuses only on the rental rate without negotiating these other terms typically pays for that focus over the lease lifetime.

7. Why the Asian regional case is distinctive

Asian regional aviation has several characteristics that shape how lease structures play out in practice:

High growth, capital-constrained operators. Many Asian regional carriers are growing fast in markets where capital availability is uneven. Leasing provides scale without requiring the capital base that ownership demands. LCCs in particular have built their entire commercial model around lease-based financing.

Chinese lessor expansion. BOC Aviation (Singapore-based, Bank of China owned), CDB Aviation (China Development Bank), ICBC Leasing, and other Chinese-funded lessors have grown substantially over the past decade, becoming significant providers of capacity to Asian regional carriers. The geographic and political proximity often makes these lessors preferred partners for Chinese and Southeast Asian operators.

Active sale-leaseback market. The combination of large order books from rapidly-growing operators and capital-constrained balance sheets makes sale-leaseback transactions particularly attractive. The mechanism described in section 3 is more central to Asian regional fleet strategy than to legacy carrier strategy in other regions.

Cross-border registration complexity. Asian regional operators frequently lease aircraft registered in Ireland, Bermuda, or Cayman Islands, requiring Article 83bis arrangements that may not be as routine in regions with stronger home-state registration traditions.

Regulatory variability. Civil aviation authorities across the region vary in how they handle leased aircraft oversight, return condition disputes, and Article 83bis administration. Operators leasing aircraft for operation in multiple ASEAN states must navigate this variability, and lease terms should reflect the practical regulatory environment of the operating jurisdiction.

8. Strategic trade-offs

For a carrier deciding between ownership, dry lease, sale-leaseback, and wet lease, the strategic trade-offs are not just financial. Each structure imposes different operational, regulatory, and strategic constraints.

Ownership maximises long-term flexibility but maximises capital commitment and residual value risk. Owned aircraft can be modified, painted, configured, and disposed of at the operator’s discretion. The asset shows on the balance sheet, the residual value risk is the operator’s, and the capital is tied up for the aircraft’s economic life.

Dry operating lease optimises capital and flexibility but accepts ongoing rental costs and return condition obligations. The operator gains operational control similar to ownership without bearing residual value risk, but pays for that through lease rent that exceeds the equivalent cost of ownership over the asset’s life. Lease end discipline (returning the aircraft in agreed condition) requires sustained operational attention.

Sale-leaseback monetises order book value but commits the operator to ongoing lease economics. The cash from the sale is available immediately for other uses, but the same aircraft now generates monthly rent rather than depreciation. The operator has converted a one-time capital event into an ongoing operating cost.

Wet lease maximises short-term flexibility but is uneconomic for sustained use. The block-hour rate on a wet lease is substantially higher than the equivalent dry lease plus crew/maintenance costs, because the wet-lease operator carries overhead and earns margin. Wet leases work for short-term needs; they do not work as a primary fleet financing strategy.

The right structure for any given aircraft depends on how the aircraft fits the operator’s strategy: a core fleet aircraft on a 10-year route is a candidate for dry operating lease or sale-leaseback; a temporary capacity addition for the Hajj season is a candidate for wet lease; a long-term strategic aircraft type that the operator wants permanent control of is a candidate for ownership. Most large operators run mixed portfolios, deploying each structure where it fits best.

9. Three rules for the fleet planner

For carriers navigating lease decisions, three working rules:

Rule 1: Negotiate return conditions as seriously as monthly rent. Return conditions can transfer millions of dollars of value over a 10-year lease. Airlines that focus only on the rent rate typically discover the cost of poor return condition terms only when the aircraft is returning, at which point negotiating leverage has evaporated.

Rule 2: Plan Article 83bis administration as a permanent workstream. Cross-border lease structures with State of Registry and State of Operator in different jurisdictions require continuous administrative attention. The Article 83bis agreement is not a one-time setup; it requires ongoing maintenance of relationships with both regulators and updates as the lease portfolio evolves.

Rule 3: Match lease structure to aircraft strategic role. A wet lease for a permanent route is a waste of money. A 12-year dry operating lease for a temporary seasonal aircraft is a strategic mistake. The structure should fit the role; carriers that default to a single lease structure for all aircraft typically pay for that simplification over time.

Closing

Aircraft leasing is not glamorous, but it is the financial infrastructure that allows most Asian regional carriers to operate at the scale they do. The structural choices an operator makes (dry vs wet, operating vs finance, lease vs sale-leaseback) cascade through capital planning, network strategy, regulatory compliance, and operational flexibility. Getting these choices right early in a fleet plan saves substantial cost and strategic time later; getting them wrong creates obligations that are difficult and expensive to unwind.

The next article in this series will focus specifically on wet-lease and ACMI operations: when carriers use them, how the contracts are structured, and which ACMI providers are active in the Asian regional market. The general framework introduced here will provide the foundation for that more specific discussion.

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This article describes general aircraft leasing structures used in commercial aviation. Specific lease terms, regulatory treatments, and tax implications vary by jurisdiction and by transaction. Practitioners should consult qualified aviation legal and finance advisers before structuring or modifying lease arrangements. Lessor market share figures, transaction values, and operator examples cited reflect publicly reported information as of 2026 and are subject to change.