Willis Lease Finance Corporation through its subsidiaries is engaged in acquiring and leasing pursuant to operating leases, commercial aircraft engines and related aircraft equipment and the selective sale of such engines. The Company�s operating segments include Equipment Leasing and Spare Parts Sales. As of December 31, 2013, the Company had a total lease portfolio consisting of 202 engines and related equipment, four aircraft and five spare parts packages with 82 lessees in 41 countries. As of December 31, 2013, the Company managed a total lease portfolio of 43 engines and related equipment for other parties. The Company is the servicer and administrative agent for Willis Engine Securitization Trust (WEST). Willis Aeronautical Services, Inc. (WASI) is its wholly-owned subsidiary.