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In a couple of hours time the last scheduled flight of NASA's X-43A scramjet test vehicle will take place over the Pacific test range off the coast of Southern California.

CREDIT: NASA TV

The previous sucessful X43-A test flight in March 2004
Despite this upcoming flight, future US led research into this technology looks to be unlikely. Funding for the Hyper-X long term research programme was cancelled following Bush's announcement in January that America would revive plans for manned missions to the Moon.