Production. Airplane manufacture, general. An employee in North American Aviation's sheet metal sub-assembly department at Inglewood, California, uses a emery wheel to smooth out a weld in a plane part. This plant produces the battle-tested B-25 ("Billy Mitchell") bomber, used in General Doolittle's raid on Tokyo, and the P-51 ("Mustang") fighter plane, which was first brought into prominence by the British raid on Dieppe