 Four professional parachutists performed the parachute jump from the rear exit stair of the Boeing 727.Other aircraft in the film were the wrecks found in the Davis–Monthan Air Force Base, including twin-engine and four-engine propeller aircraft such as the Douglas C-47 Skytrain, Lockheed P2V Neptune, Lockheed C-121 Constellation and Douglas C-54 Skymaster.Numerous Sikorsky H-34 and Sikorsky CH-37 Mojave helicopters were also featured.