Wet Lease vs Dry Lease Aircraft: A Business Aviation Guide

A wet lease—technically an ACMI lease—is an arrangement in which the lessor provides the Aircraft, Crew, Maintenance, and Insurance as a single package. The lessor retains operational control throughout. The lessee uses the aircraft but does not operate it; the lessor’s AOC governs every departure. ACMI structures suit short to medium-term requirements: seasonal peaks, maintenance coverage, route proving, and capacity gaps that cannot wait for a longer procurement cycle.

A dry lease transfers the aircraft to the lessee without crew, maintenance, or insurance. The lessee assumes full operational control and must hold an appropriate AOC to operate the aircraft commercially. Without that authority, a dry-leased aircraft cannot conduct flights for hire. Dry leases suit established operators expanding fleet capacity while maintaining control over their operational brand, safety management system, and crew standards.

Operational control is the single issue every regulator examines first in a wet lease vs dry lease compliance question. Under a wet lease, operational control is retained by the lessor throughout. Under a dry lease, it transfers fully to the lessee. Everything downstream—which party’s AOC governs the flight, who carries regulatory accountability, how maintenance is managed—flows directly from that one determination.

Under a wet lease, the lessor provides flight deck and cabin crew under its own AOC. The lessee has no responsibility for crew sourcing or scheduling. Under a dry lease, the lessee provides all crew, who must hold appropriate type ratings for the aircraft type and jurisdiction of operation. If the lessee does not have existing crew infrastructure for that aircraft type, a staffing solution must be confirmed before operations begin.

Under a wet lease, maintenance and airworthiness management remain the lessor’s responsibility throughout the arrangement. Under a dry lease, the lessee assumes full CAMO-level airworthiness oversight—a substantial operational commitment requiring an established CAMO relationship before the lease begins. Operators without a functioning CAMO structure in place are structurally unsuited to a dry lease arrangement and should treat that gap as a planning prerequisite, not an afterthought.

Under a wet lease, the lessor arranges and maintains required coverage throughout. Under a dry lease, the lessee independently arranges insurance; coverage terms, minimum limits, and named-insured structures are all negotiated elements of the lease agreement. Duration follows the same logic: wet lease structures are designed for short to medium-term capacity gaps, while dry leases are long-term arrangements suited to stable fleet expansion rather than bridge capacity.

A wet lease is appropriate when the lessee does not hold an AOC or type-rated crew for the aircraft in question, when the requirement is short-term or seasonal, when immediate operational access is needed without building infrastructure, or when a maintenance event has grounded the lessee’s own aircraft. Speed of activation is a meaningful operational advantage: the lessor’s existing infrastructure means operations can begin quickly without regulatory setup on the lessee’s side.

A dry lease is appropriate when the lessee holds an AOC and has type-rated crew available, when the requirement is long-term and operationally stable, and when the lessee wants full control over its brand standards and safety management system. Both structures require a written lease agreement meeting the regulatory requirements of the operating jurisdiction. The agreement is the document regulators read when an operational control question arises.

Aviation regulation in every major jurisdiction distinguishes wet from dry leases on the basis of operational control. Under FAA regulation, wet lease arrangements require written agreements that clearly establish the lessor’s operational control; EASA and Transport Canada apply equivalent principles. For international operations, the regulatory obligations of both the country of registry and the country of operation apply—creating compliance complexity around crew licensing, maintenance oversight, and insurance validity that belongs in the scoping phase, not operations.

Registry selection determines which civil aviation authority oversees an aircraft’s airworthiness and which regulations apply to its operations. For operators planning European flights, the Irish EJ Registry, administered under EASA oversight, is a confirmed registration option that ACASS facilitates through its Irish AOC operation, established in 2020. Registry selection, crew provision, and airworthiness oversight are connected planning elements that are best scoped together rather than solved sequentially after a lease is signed.

For operators considering a wet lease, ACASS provides direct AOC-backed charter and ACMI operations under its own regulatory authority in Canada, Ireland, and San Marino. The arrangement is not sub-contracted to a third-party operator, which matters for both accountability and the speed at which operational questions can be resolved. IS-BAO Stage 3 certification, awarded in 2017, and ARGUS Gold certification, held since 2013, apply to all ACASS-operated arrangements.

For operators structuring a dry lease, ACASS’s Flight Crew Staffing service addresses type-rating and crew provision requirements. Its Technical Consultancy capability supports CAMO and airworthiness management. Irish Registry facilitation covers registry selection for European operations. The wet lease vs dry lease decision rarely sits in isolation—it connects to registry, crew infrastructure, and multi-jurisdiction regulatory compliance. Treating it as a standalone commercial question is how most lease structures go wrong.

Wet lease and dry lease structures serve distinct operational needs. The right choice depends on the lessee’s AOC status, crew infrastructure, required duration, and the regulatory framework of the jurisdictions involved. Getting the structure wrong carries material regulatory and operational consequences. ACASS operates across both structures, three jurisdictions, and more than 30 years of business aviation experience.

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