Willis Lease Finance Corp with its subsidiaries is a lessor and servicer of commercial aircraft and aircraft engines. The company has two reportable business segments namely Leasing and Related Operations which involves acquiring and leasing, pursuant to operating leases, commercial aircraft, aircraft engines and other aircraft equipment and the selective purchase and resale of commercial aircraft engines and other aircraft equipment and other related businesses and Spare Parts Sales segment involves the purchase and resale of after-market engine parts, whole engines, engine modules and portable aircraft components. The company generates the majority of its revenue from leasing and related operations.