Aircastle is a holding company. Through its subsidiaries, Co. acquires, leases, and sells commercial jet aircraft to airlines throughout the world. Co. owns and manages on behalf of its joint ventures several aircraft leased to lessees located in various countries. Co.'s aircraft are subject to net leases whereby the lessee is generally responsible for maintaining the aircraft and paying operational, maintenance and insurance costs. In many cases, however, Co. is obligated to pay a portion of specified maintenance or modification costs. Co.'s aircraft types include: A319/A320/A320neo/A321, A330-200/300, 737-700/800/900ER, 777-300ER, E195 and freighters.