SpaceShipOne is a vehicle built to travel to the lower limits of outer space. It completed the first manned private spaceflight in 2004. That same year, it won the US$10 million Ansari X Prize and has not flown since winning. It was carried high into the air by a specially designed plane named "White Knight". Both vehicles were built and flown by Mojave Aerospace Ventures. This was a joint project between Paul Allen and Scaled Composites, Burt Rutan's flying machine company. Allen provided the money to build and fly SpaceShipOne, about US$25 million.