Willis Lease Finance Corporation leases and services commercial aircrafts and aircraft engines worldwide through two main segments, Leasing and Related Operations and Spare Parts Sales. The company purchases and resells aircraft equipment and focuses on engine management and consulting business, serving commercial aircraft operators, maintenance, repair, and overhaul organizations. As of December 31, 2021, Willis Lease Finance Corporation had a total lease portfolio of 304 engines, 12 aircrafts, and other leased parts and equipment, with 76 lessees in 40 countries.