The scheme is the well-known one of using a jet aircraft high in the stratosphere as a launch platform for a rocket to carry payloads into space. This is already being done - and was used as a means of deploying anti-satellite weapons back in Cold War times - but Allen intends to scale up the concept massively, using a colossal aeroplane to lift bigger rockets than any before launched in mid-air and deliver much larger cargoes to orbit - perhaps one day, even manned spacecraft.
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