Nasa has flown an unmanned experimental jet to a speed that preliminary data suggested was just short of 10 times the speed of sound - a record.
The X-43A - a supersonic combustion ramjet (scramjet) - made the run over a naval test range in the Pacific Ocean.
The 3.7m-long vehicle had already set a world best for an "air breathing" jet of Mach 6.83 - nearly seven times the speed of sound - on a flight in March.
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