Production. Airplane manufacture, general. Sheet metal plane parts, previously cut on a router are pressed to all the required shapes on Masonite dies in a 3,000 ton hydraulic press in the Inglewood, California, plant of North American Aviation, Incorporated. Four crews of girls, one at each side, feed and operate the press. The actual forming operation takes only about ten seconds. 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