Not all the exterior/in flight shots are of an L-1011. Some of the shots used are actually darkened shots of Boeing 727s in flight. The difference is that on a 727, the rear tail assembly features wings above the fuselage and all 3 engines are located in proximity. On an L-1011, the two main engines are on the front wings and the tail engine is above the rear cabin but the rear wings are level with the front wings.