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Virgin Galactic's SpaceShipTwo rocket plane, the vehicle most
likely to become the world's first truly commercial spaceship, fired its engines
in flight for the second time ever on Thursday.

Following up on its first powered flight in April, the craft went supersonic
once more —and tested its wing-tilting re-entry system for the first time,
Virgin Galactic said in a series of Twitter updates.

The company said the flight test "hit our planned duration, altitude and speed."
The hybrid rocket engine was fired for 20 seconds, sending SpaceShipTwo to a
maximum velocity 1.43 times the speed of sound and a maximum altitude of 69,000
feet (21 kilometers), Virgin Galactic reported. That compares with 16 seconds, a
top speed of Mach 1.2 and a maximum altitude of 56,200 feet for April's flight.

Thanks to special correspondent Russ Brown.