A wet lease is a commercial aviation arrangement where one airline (the lessor) provides another airline (the lessee) with an aircraft, flight crew, maintenance support, and insurance as a single package.
How It Works#
In a wet lease, the lessor retains operational control of the aircraft. The crew remains employed by the lessor and follows its procedures, training standards, and safety management system. The lessee pays for the arrangement but does not direct the crew or manage airworthiness.
This is the key distinction that regulators care about. Because the lessor's crew operates the flight, the lessor holds the Air Operator Certificate (AOC) that governs that operation. In practice, this means the flight may carry the lessee's branding and flight number while being operated entirely under the lessor's certificate.
Wet leases are common in two situations. First, airlines use them to cover sudden capacity gaps, such as an unexpected aircraft grounding or a surge in demand. Second, they allow airlines to enter new markets quickly without acquiring and certifying their own aircraft.
The term contrasts with a dry lease, where an airline leases the aircraft only. Under a dry lease, the lessee provides its own crew and operates the aircraft under its own AOC.
Example in Aviation#
A regional carrier unexpectedly grounds three aircraft after a maintenance finding. Peak summer season starts in two weeks. Rather than cancel hundreds of flights, the airline arranges a wet lease with a lessor that has spare capacity. The lessor supplies the aircraft and crew. Passengers see the regional carrier's livery and flight code on their boarding passes, but the cockpit crew works for the lessor.
Why It Matters#
Wet leases sit at the intersection of commercial aviation and regulatory oversight. Regulators such as the FAA and EASA scrutinize wet lease agreements closely, because a lessee cannot simply import safety standards from a foreign operator. In the United States, wet leases involving foreign air carriers are subject to approval under 14 CFR Part 212.
For pilots and crew, understanding wet leases clarifies why crew members may operate flights under a different airline's brand. Their legal obligations, duty time limits, and procedures remain those of their actual employer, the lessor, not the lessee.
Key Takeaways#
- A wet lease includes the aircraft, crew, maintenance, and insurance as one package.
- The lessor, not the lessee, retains operational control and AOC responsibility.
- Wet leases differ from dry leases, where the lessee supplies its own crew.
- Airlines use wet leases to handle capacity gaps or enter new markets quickly.
- Regulators treat wet leases as distinct operations requiring specific approval.