Willis Lease Finance Corporation, together with its subsidiaries, leases and services commercial aircraft and aircraft engines worldwide. The company operates through two segments, Leasing and Related Operations, and Spare Parts Sales. It also purchases and resells commercial aircraft engines; and sells aircraft engine parts and materials. The company offers noise-compliant Stage IV commercial jet engines. It serves airlines and aircraft engine manufacturers, as well as maintenance, repair, and overhaul providers. As of December 31, 2018, the company had a total lease portfolio of 244 engines and related equipment, 17 aircraft, and 10 other leased parts and equipment with 81 lessees in 47 countries; and managed a total lease portfolio of 440 engines and related equipment on behalf of other parties. Willis Lease Finance Corporation was founded in 1985 and is headquartered in Coconut Creek, Florida.