Wet leasing is an aviation industry arrangement where one airline (the lessor) provides an aircraft, complete crew, maintenance, and insurance (ACMI) to another airline (the lessee), which then operates the flights under its own flight numbers. This is a common "short-term" solution used in 2026 to handle sudden capacity shortages, such as during peak summer travel or when an airline's own fleet is grounded for unexpected maintenance. For the passenger, the flight might feel slightly different as the cabin crew will be in a different uniform and the plane may have a different interior, though the booking and "service level" should remain consistent with the airline they originally booked with. Wet leasing is significantly more expensive than "dry leasing" (where only the aircraft is provided), but it offers unparalleled flexibility for airlines to maintain their schedules during operational crises without having to hire and train new staff on short notice.