How many people can fly on Virgin Galactic's SpaceShipTwo space plane?
Virgin Galactic's first commercial spaceflight, a four-passenger mission, is scheduled to launch on Thursday (June 29). How many people can the company's SpaceShipTwo really carry?
TroibNews 
Virgin Galactic's first commercial spaceflight, a four-passenger mission, is scheduled to launch on Thursday (June 29). How many people can the company's SpaceShipTwo really carry?
