The U.S military's Falcon HTV-2 was launched with promises of it being able to travel from London to Sydney in less than an hour with speeds reaching 22 times the speed of regular planes.
The plane itself is attached to a rocket before disengaging on the edge of space an re-entering the atmosphere but after a smooth start, the Californian air base lost signal after nine minutes - at which point the plane had flown for 139 seconds and had reached nearly 17,000mph!
The plane had already encountered a host of problems in testing with two test flights already being cancelled prior to this one. It's little wonder when you realise that the vehicle travels on average at 13,000mph or 20 times the speed of sound on its journey!
Hopefully this will not blemish the reputation of the hypersonic flight too much and we will see more examples of these amazing planes being tested soon.