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Boeing Flying Fortresses. Latest Boeing Flying Fortresses. This, the newest and most formidable in the Boeing Flying Fortress series, is [described by] the War Department as "bigger and more deadly" than any of its predecessors. This new airplane, a 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 Corporation

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