This excerpt taken from the AYR 8-K filed Sep 26, 2007.
The Aircraft Leasing segment consists of amounts earned from our commercial aircraft leasing operations. All of our aircraft are subject to net operating leases whereby the lessee is generally responsible for maintaining the aircraft and paying all operational and insurance costs. In many of our leases we are obligated to bear a portion of maintenance costs or costs associated with modifications required by manufacturers or regulators. We retain the benefit, and bear the risk, of re-leasing and the residual value of the aircraft upon expiration or early termination of the lease.