Production. B-17 heavy bomber. A landing wheel, with its huge rubber "shoe," is trundled out in a service tractor to a new B-17F (Flying Fortress) bomber awaiting completion at Boeing's Seattle plant. The tractor operator, like half of the plant's workers, is a woman. 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. Sourced from the Library of Congress.