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Boeing Flying Fortresses. Latest Boeing Flying Fortresses.This, the newest and most formidable in the Boeing Flying Fortress series, is the B-17E described by the War Department as "bigger and more deadly" than any of its predecessors. This new airplane, key weapon in America's war program, is now in mass production at the Boeing Aircraft Company. Under a special tri-company production pool arrangement, it is also being built in quantity by the Douglas Aircraft Company and by the Vega Aircraft Company, a subsidiary of Lockheed Aircraft Corporation

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