Space Station V, possibly hinting that there are four others like it, is a space station held in low Earth orbit that serves as a transfer point from Earth to the Moon and other planets. It is run by Hilton Hotels and also serves as an obrital hotel. The station has a double-wheel design, the second wheel still under construction. Two docking bays exist, one on each opposite end of the station's axis, on which it spins itself to stimulate artificial gravity. It is reached by spaceplanes, like the Orion III, that are run by Pan American World Airways. (2001: A Space Odyssey)