Production. Airplane manufacture, general. Women are proving themselves excellent technicians at the Long Beach, California, plant of Douglas Aircraft Company. These airplane engine mechanics learned all they know about their jobs at the company school, and now there putting their knowledge to use. 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 trrops and cargo