Production. Airplane maufacture, general. At the Long Beach, California, plant of Douglas Aircraft Company, scrap metal is carefully segregated in separate boxes for the maximum salvage at the smelter. Most important of the many types of aircrafts made at this plant are the B-17F ("Flying Fortress") heavy bomber, the A-20 ("Havoc") assault bomber and the C-47 heavy transport plane for the carrying of troops and cargo