Production. Airplane manufacture, general. Model makers prepare accurately sealed minatures of planes built at the Inglewood, California, plant of North American Aviation, Incorporated. Here an experimental model of the P-51 ("Mustang") is being finished for wind tunnel and other tests. 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