With quadruple engines, twin fuselages and a wingspan of over 140 feet (43m), WhiteKnightTwo is capable of carrying SpaceShipTwo to an altitude of 50,000 feet (15,000m). There, SpaceShipTwo separates, the rocket boosters kick in and the vessel reaches 361,000 ft (110,000m). For five minutes passengers are weightless before the engines cut and the vessel begins its unpowered glide back to the spaceport. Most of us can't afford the $250,000 price tag of a ticket, but we can keep the dream alive with this model.