December 1942. "Production. B-17 heavy bomber. The four mighty engines of a new B-17F (Flying Fortress) bomber warm up at the airfield of Boeing's Seattle plant as another warship of the air awaits its flight test. The Flying Fortress has performed with great credit in the South Pacific, over Germany and elsewhere. It is a four-engine heavy bomber capable of flying at high altitudes." Photo by Andreas Feininger for the Office of War Information.
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