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This hypersonic airliner would take you from Los Angeles to Tokyo in under two hours
United plans supersonic passenger flights by 2029 - BBC News
Science: evidence is intelligence - New hypersonic rocket engine poised to cut London-Sydney flight times to just 4 hours by 2030s: 'Tourists could fly from Britain to Australia in just four hours (
Mach c'? Scientists observe sound traveling faster than the speed of light