The high-altitude launch is the first commercial US flight beyond the atmosphere since 2011 – and a major advance for civilian space travel.
More than 600 people have bought tickets – some paying $250,000 – for the chance of four minutes of weightlessness beyond the reach of gravity.
The company’s boss Sir Richard Branson has told Sky News he hopes a commercial flight will take place by March 2019.
(Source: Sky News YouTube channel)
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