Virgin Galactic, the company behind the development of SpaceShipTwo and private space tourism, says yesterday's flight marked the first time SpaceShipTwo flew with a crew on board. Peter Siebold, test pilot and director of flight tests at Scaled, joined fellow test pilot Michael Alsbury aboard the VSS Enterprise as it remained mated with WhiteKnightTwo throughout the flight. It was the third captive flight for the craft and the 33rd flight for the mother ship. The craft spent six hours and 12 minutes aloft testing SpaceShipTwo's systems. Virgin says all went well.