Production. Airplane manufacture, general. The sculptor's art plays an important part in making dies for the production of modern airplanes. An old master at the Inglewood, California plant of North American Aviation, Incorporated works with plaster mixed to the proper consistency by a young woman assistant. From his plaster models will be made the metal dies with which plane parts are formed in hydraulic presses. 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