"The A2 designed to carry up to 300 passengers from Brussels to Sydney in under 4 hours. The speedy airliner will benefit from a 2-mode engine — turbojet and ramjet propulsion systems — that will make it both extremely efficient at slow speeds and able to reach top speeds with great ease. Used in quick succession, these 2 modes allow the A2 to seamlessly shift from Mach-2.5 to Mach-5"http://www.gadgettastic.com/2008/01/28/cleaner-flying-a2-hydrogen-powered-hypersonic-airliner/
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