 When the crew filmed segments of a scene with a Hercules airplane  taking place on a Schiphol landing strip, shooting at a British  airport, they were not allowed to operate the airplane. Since the  scene required the plane to drive and fly, the crew had to  improvise. Some shots of the plane driving were accomplished by  towing it behind a different vehicle, or simply filming the idle  plane while driving past it, creating the illusion of it driving. In  another scene a photograph of the plane was digitally altered to  look three