Virgin Galactic's WhiteKnightTwo/SpaceShipTwo launch system is still in testing and she says it is up to them when they decide it is safe to fly tourists to the edge of space.

维京银河系的发射系统目前仍在检测，她说直到他们觉得安全了才会载着游客在太空中翱翔。

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The WhiteKnightTwo and SpaceShipTwo spacecraft will launch commercial spaceflights from the site by 2013.

BBC: The futurist: The sustainable Spaceport America

And WhiteKnightTwo, or "Eve" as this aircraft is known, is going to be kept extremely busy, making for a very efficient operation.

BBC: Science & Environment

It took off slung beneath the WhiteKnightTwo aircraft, which does the job of lifting the rocket plane to its launch altitude - some 45, 000ft (14km).

BBC: Science correspondent, BBC News