The Orion III is a fictional passenger spaceplane seen in the movie 2001: A Space Odyssey. It is a two-stage space shuttle launched on a reusable winged booster. It is equipped with aerospike rocket engines and jet engines for atmospheric flight. Pan American World Airways operates the Orion III, just as it operates the Aries Ib. In early stages of planning for the film, the spaceplane's engines on the back were designed to break away from the passenger section of the plane.