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The Boeing B-17 Flying Fortress is a four-engine heavy bomber developed in the 1930s for the United States Army Air Corps (USAAC). Competing against Douglas and Martin for a contract to build 200 bombers, the Boeing
entry outperformed both competitors and exceeded the air corps'
performance specifications. Although Boeing lost the contract because
the prototype crashed, the air corps ordered 13 more B-17s for further
evaluation. From its introduction in 1938, the B-17 Flying Fortress
evolved through numerous design advances.
