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It was a relatively fast, high-flying, long-range bomber with heavy defensive armament at the expense of bombload. The B-17 evolved through numerous design advances but from its inception, the USAAC (later, the USAAF) promoted the aircraft as a strategic weapon. Still, the Air Corps ordered 13 more B-17s for further evaluation, then introduced it into service in 1938. In a USAAC competition, Boeing's prototype Model 299/XB-17 outperformed two other entries but crashed, losing the initial 200-bomber contract to the Douglas B-18 Bolo. It was also employed as a transport, antisubmarine aircraft, drone controller, and search-and-rescue aircraft.

It is the third-most produced bomber of all time, behind the four-engined Consolidated B-24 Liberator and the multirole, twin-engined Junkers Ju 88.

Relatively fast and high-flying for a bomber of its era, the B-17 was used primarily in the European Theater of Operations and dropped more bombs than any other aircraft during World War II. The Boeing B-17 Flying Fortress is a four-engined heavy bomber developed in the 1930s for the United States Army Air Corps (USAAC).

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