Flying across the world from Europe to Australia currently takes around 20 hours in a regular passenger jet. But Swiss startup Destinus is looking to slash that time to just four hours by taking jet travel to hypersonic speeds. Founded by Russian-born physicist and serial entrepreneur Mikhail Kokorich, Destinus is developing a prototype hydrogen-powered aircraft capable of travelling at Mach 5 and above. Thats five times the speed of sound: over 6000 kph. This would take you from Frankfurt to Sydney in just over four hours. London to New York? 90 minutes. To achieve such speeds the aircraft would…

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