The Boeing AT-15 was an American twin-engined bomber crew trainer designed and built by Boeing's Wichita Division. Only two prototypes, designated XAT-15, were built. The proposed name Crewmaker was not officially adopted. Designated X120 by the company, two examples were ordered by the United States Army Air Corps as the XAT-15. The AT-15 was a high-wing cantilever monoplane with two wing-mounted Pratt & Whitney R-1340 Wasp radial engines. It had a retractable tailwheel landing gear and an extended glazed fuselage nose for the trainee bomb-aimer. Due to shortage of materials, the aircraft was built of welded steel tube covered with plywood, with wooden wings and tail unit. The X120 was accepted for production as the AT-15. A total of 1,045 were ordered, with 325 to be built by Bellanca, 360 by McDonnell and the rest by Boeing. Before construction got underway the Air Force had a change of heart and decided not to use composite construction for its advanced trainers, the program was cancelled. McDonnell ended up building the Fairchild AT-21 bomber trainer selected by the USAAC after the first contract was cancelled. First flight was sometime in 1942.