Wet Lease
A lease arrangement in which an airline rents an aircraft together with the crew, maintenance, and insurance from another operator.
A wet lease is an aircraft leasing arrangement in which the lessor (the providing airline or operator) supplies not only the aircraft but also the flight crew, cabin crew, maintenance services, and insurance — collectively referred to as ACMI (Aircraft, Crew, Maintenance, and Insurance). The lessee airline uses the leased operation under its own commercial brand and flight numbers but does not operate the aircraft with its own personnel. Wet leases are used to cover capacity gaps, seasonal demand spikes, or aircraft maintenance periods.
Why it matters
For corporate travellers, wet leases create situations where the airline whose name is on the ticket and the airline whose staff and aircraft actually deliver the service are different — similar to codeshare but with a full operational replacement rather than just a different flight code. Service standards, seat configurations, and crew procedures may differ from the marketing carrier's norm. For programme managers on routes where wet leases are common — particularly during summer peaks or during fleet transitions — monitoring the actual operating aircraft is useful for managing traveler expectations.
How it works in practice
Airlines engage wet lease arrangements typically for periods of weeks to months, often disclosed on booking systems as 'operated by [leasing airline]'. The leasing company's crew follow the operating carrier's safety procedures but may have different service protocols for cabin service. Passengers typically board under the marketing carrier's brand — check-in, boarding passes, and baggage handling remain with the marketing carrier in most cases, while the inflight experience is provided by the lessor's crew.
The takeaway
When routes on key corporate corridors show unusual aircraft or operator changes close to departure, check whether a wet lease is in effect. If the configuration or service standard differs materially from what travellers have been prepared to expect, communicate this proactively in pre-trip itinerary information. The goal is to prevent traveler dissatisfaction from an unexpected experience, not to block the booking — wet lease operations are fully legitimate and typically perfectly safe.