Wet Lease, Dry Lease, or ACMI: The Compliance Implications Asia Private Aviation Operators Get Wrong Before Signing
Choosing between a wet lease, dry lease, or ACMI arrangement is not primarily a commercial decision - it is a compliance decision with commercial consequences. Each structure assigns operational control, crew responsibility, and regulatory liability differently, and signing the wrong agreement without understanding those assignments can expose an Asia-based operator to AOC violations, insurance gaps, and audit failures that no amount of legal drafting can fix after the fact. The structure you choose determines who holds the Air Operator Certificate, who is responsible for the crew, and which national aviation authority has jurisdiction over your operation - and in Asia’s multi-registry, multi-jurisdiction environment, those questions are rarely straightforward [nbaa.org].
TL;DR
- A dry lease transfers only the aircraft; the lessee must hold a valid AOC and take full operational control [nbaa.org].
- A wet lease (including ACMI) keeps the lessor’s crew, maintenance, and operational control in place, but the lessee’s compliance obligations do not disappear [sassofia.com].
- ACMI is a specific wet lease variant where the lessee provides insurance and fuel - but not crew or maintenance - making it a capacity tool with its own distinct risk profile [lvoyage.aero].
- Misclassifying your lease structure is one of the most common pre-signature errors in Asia private aviation, with direct consequences for insurance validity and AOC compliance [sassofia.com].
- Independent review of lease structure against your operating certificates before signing is not optional; it is a baseline requirement for audit-readiness.
About the Author: This article is written by the team at Private Aviation Technology Ltd. (PATL), an independent firm specializing in AOC compliance, operations design, and regulatory architecture for private aviation operators across Asia. PATL’s team includes Ray Wilson, an IS-BAO Accredited Auditor with 15 years of leadership across military, commercial, and business aviation and multi-registry AOC compliance expertise.
What Is the Actual Difference Between a Dry Lease, Wet Lease, and ACMI?
These three terms describe meaningfully different allocations of operational control and legal responsibility - not just different price points on the same service.
Dry lease: The owner provides the aircraft only. No crew, no maintenance, no operational support [flyingfinance.com]. The lessee takes full operational control, which means the lessee must hold its own AOC to operate commercially. The aircraft operates under the lessee’s certificate, not the owner’s [nbaa.org].
Wet lease: The lessor provides the aircraft with crew, maintenance, and insurance (CAMO) [aircharter-international.com]. Operational control stays with the lessor. The lessee is essentially purchasing capacity, not taking on an aircraft [blackjet.com].
ACMI (Aircraft, Crew, Maintenance, Insurance): A specific wet lease variant where the lessor bundles the aircraft, crew, maintenance, and insurance into one package. The lessee provides ground handling and pays for fuel [lvoyage.aero]. ACMI is common in scheduled and charter airline contexts as a capacity management tool, where the lessee needs lift without acquiring operational responsibility [iclg.com].
| Structure | Who Provides Crew | Operational Control | Lessee Needs AOC? |
|---|---|---|---|
| Dry Lease | Lessee | Lessee | Yes [nbaa.org] |
| Wet Lease | Lessor | Lessor | Generally No [blackjet.com] |
| ACMI | Lessor | Lessor | Generally No [lvoyage.aero] |
Why Does Lease Structure Determine Your Compliance Obligations?
Building on that distinction, the compliance implications are not a matter of degree - they are a matter of kind. The structure you sign determines which regulatory framework governs your operation and who is accountable to which authority.
Under a dry lease, the lessee becomes the operator of record [nbaa.org]. That triggers full AOC obligations: the lessee must demonstrate that it has the required organization, qualified crew, approved maintenance arrangements, and safety management systems in place. If the lessee does not hold a valid AOC - or if its existing AOC does not cover the aircraft type or operational category - the operation is non-compliant from day one.
Under a wet lease or ACMI arrangement, the lessor retains operational control and accountability. However, the lessee’s compliance obligations do not disappear entirely. Regulatory frameworks such as ORO.AOC.110 (applicable in EASA jurisdictions and referenced by several Asian authorities as a standard) position the lessee’s compliance function as an oversight auditor over the lessor’s operation during the lease period [sassofia.com]. In practice, this means the lessee must verify the lessor’s AOC validity, crew qualifications, insurance certificates, and maintenance approvals - not simply accept the lessor’s assurances at face value.
The practical takeaway: wet lease and ACMI do not offload compliance responsibility onto the lessor. They change the form of that responsibility, from operational management to structured oversight.
What Are the Most Common Pre-Signature Errors in Asia?
Stepping back from the regulatory framework, the errors that actually cause problems for operators are often procedural rather than technical. Based on the operating environment across Asia’s multi-registry, multi-jurisdiction landscape, the following patterns appear repeatedly.
1. Misclassifying the structure. Operators often sign agreements that use the words “dry lease” or “wet lease” without confirming that the operational control provisions in the contract match that label. A contract that calls itself a dry lease but includes the original owner’s crew scheduling arrangements may function as a wet lease - with regulatory consequences neither party anticipated.
2. Ignoring AOC scope before signing a dry lease. An operator with a valid AOC may not have approval for the specific aircraft type, operation category, or international routing covered by the proposed lease. Scope gaps are common in Asia, where operators frequently add aircraft types or expand routes without updating their AOC first.
3. Failing to verify the lessor’s certificates on wet lease and ACMI. Accepting a lessor’s verbal assurance that their AOC and insurance are current is not due diligence. Certificate verification needs to be documented before operations begin and maintained throughout the lease period [sassofia.com].
4. Underestimating cross-border complexity. Asia’s aviation environment involves a wide range of national authorities with different requirements for validating foreign leases. A structure compliant in one jurisdiction may require additional approvals or notifications in another.
5. Not accounting for IS-BAO audit exposure. If the operator is IS-BAO certified or pursuing certification, the lease structure affects how the operator documents operational control and safety management responsibilities. IS-BAO Stage assessments will scrutinize these lines of accountability.
How Should Operators Approach Lease Structure Review Before Signing?
A related but distinct question is what a structured pre-signature review actually involves. This is not a legal review of contract terms in isolation - it is an operational and regulatory review run in parallel with the legal process.
A sound review covers the following:
- AOC scope check: Confirm that the operator’s existing certificate covers the aircraft type, operation category, and intended routes.
- Operational control mapping: Confirm that the contract’s operational control provisions match the lease classification.
- Lessor certificate verification: Obtain and document current AOC, airworthiness, and insurance certificates from the lessor (wet lease and ACMI).
- Cross-border notification requirements: Identify which authorities require notification or approval for the lease in each jurisdiction of intended operation.
- Insurance alignment: Confirm that hull, liability, and war risk coverage is consistent with the lease structure and does not contain exclusions triggered by misclassification.
- IS-BAO and audit-readiness check: If the operator is on an IS-BAO pathway, confirm that the lease structure’s accountability lines are documented in the SMS.
Private Aviation Technology Ltd. (PATL) solves hard problems including costing architecture, operations design, AOC compliance support, and IS-BAO audits for operators across Asia. PATL’s team brings Ray Wilson’s IS-BAO Stage 3 auditor credentials and 15 years of multi-registry AOC compliance expertise, Jolie Howard’s prior CEO experience in Asia private aviation and active industry association involvement, and Bernard Lee’s enterprise systems and data integration background from global technology and aviation enterprises - the combined perspective of operations design, regulatory architecture, and enterprise technology. PATL operates independently and with strict confidentiality, so client structures, negotiations, and cost architectures remain secure throughout the process.
PATL’s sister company, L’VOYAGE (founded 2014), provides the on-the-ground Hong Kong private aviation operating heritage and regional operator network that informs PATL’s compliance and regulatory work. That context matters when the compliance question involves a jurisdiction where the regulatory authority’s practical interpretation of a standard diverges from its written form.
Frequently Asked Questions
Do I need an AOC to enter a wet lease as the lessee? Generally, no. Under a wet lease, the lessor retains operational control and operates under its own AOC. However, the lessee retains oversight obligations and must verify the lessor’s certificates before operations begin [sassofia.com].
Can I operate commercially under a dry lease without my own AOC? No. A dry lease transfers operational control to the lessee, which requires the lessee to hold a valid AOC covering the aircraft type and intended operation [nbaa.org].
What makes ACMI different from a standard wet lease? In ACMI, the lessor provides the aircraft, crew, maintenance, and insurance. The lessee provides ground handling and fuel [lvoyage.aero]. The key distinction from a standard wet lease is the explicit bundling of insurance into the lessor’s package and the lessee’s responsibility for ground services.
What should I check in the lessor’s documents before signing a wet lease or ACMI? At minimum: the lessor’s current AOC, airworthiness certificate for the specific aircraft, crew licence and training records, and insurance certificates. These should be verified and documented, not just requested [sassofia.com].
Does lease structure affect my IS-BAO audit? Yes. IS-BAO assessments examine how an operator documents operational control, safety management responsibilities, and third-party oversight. A lease structure where accountability lines are unclear or undocumented will create findings at any Stage assessment.
What happens if my AOC does not cover the aircraft type in a dry lease? Operating outside your AOC’s approved scope is a regulatory violation, regardless of what the lease contract states. An AOC scope review should precede any dry lease signature, not follow it.
Is lease structure compliance different for business aviation versus commercial air transport in Asia? The regulatory frameworks differ, but the core principle - that operational control determines who holds regulatory accountability - applies across both. Business aviation operators in Asia should not assume that lighter-touch regulatory oversight means lease structure compliance is less consequential.
About Private Aviation Technology Ltd.
Private Aviation Technology Ltd. (PATL) solves hard problems in private aviation: costing architecture, operations design, AOC compliance support, and IS-BAO/IS-BAH audits and preparation. PATL works with aircraft owners, private flight departments, and operators across Asia navigating multi-registry and multi-jurisdiction complexity, delivering operational predictability rather than generic guidance. The firm operates with strict independence and confidentiality, ensuring that client data, cost structures, and operational strategies remain secure. Backed by the operating heritage of its sister company L’VOYAGE (founded 2014) - active in Hong Kong private aviation - PATL combines regional operator relationships built over more than a decade with a leadership team spanning military, commercial, and business aviation alongside enterprise technology.
Ready to review your lease structure before signing? Contact Private Aviation Technology Ltd. at https://www.privateaviationtech.com/ to discuss how an independent compliance review can protect your operation from day one.