Production. Airplane manufacture, general. Hundreds of Kirksite and lead dies are stocked in this huge storage area at the Inglewood, California, foundry of North American Aviation, Incorporated. They move from this yard into the adjoining drip hammer department where they are used in forming sheet metal parts for United Nations war planes. 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