Production of military airplanes at the Vultee Aircraft plant in Downey, Calif,, has been stepped up fourfold by installation of a power-operated final assembly line, said to be the first of its kind in the entire industry. For example, at the stage illustrated here, the completed fuselage and the finished tail section meet, an overhead transfer bridge carrying the fuselage across from its conveyor line to the line where tails are assembled. The operator in the foreground then adjusts the level of the fuselage so that it lines up exactly for three-point bolting to the tail piece.