Production. Airplane manufacture, general. Sheet metal parts for United Nations war planes are best treated in great ovens as quickly as they are formed on the hydraulic and toggle presses at the Inglewood, California plant of North American Aviation, Incorporated. 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