Kankoh-maru is a single-stage reusable orbital passenger aircraft is a proposed vertical takeoff and landing (VTVL), single-stage-to-orbit (SSTO), reusable launch system that has been studied by the Japanese Rocket Society since 1993. According to a document from July 1997, it would have been manufactured by Kawasaki Heavy Industries and Mitsubishi Heavy Industries. 　The passenger capacity is 50, which is the same as that of a sightseeing bus, and the crew is a pilot and a stewardess, 2 each. The rooms are