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It said the A2 would be able to keep a sustained speed of 3,800mph, more than twice the speed of Concorde.
At 143m (156yds) long, the A2 is roughly twice the size of the biggest current jumbo jets.
It would run on a liquid hydrogen engine being developed by Reaction Engines, based at Culham near Abingdon.
The company said the aircraft, which is still at the concept stage, could be operating within 25 years