Production. Airplane maufacture, general. Why our warplanes hold together through the years of steady use, rough landings and anti-aircraft fire. These rivets cover but a small part of the surface of a mighty bomber produced at the Long Beach, California, plant of Douglas Aircraft Company. Most important of the many types of aircraft 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