Boeing Plant 2 (also known as Air Force Plant 17) was a factory building which was built in 1936 by the Boeing Corporation in King County, Washington in the United States. By the time production ceased in the building, the plant had built half of the Boeing B-17 Flying Fortresses, the Boeing 307s, the Boeing 377s, some of the Boeing B-29 Superfortresses, Boeing B-50 Superfortresses, B-47 Stratojets, B-52 Stratofortresses, and the initial Boeing 737s.