The first X-43A hypersonic research aircraft.

Scientists and designers have covered a lot of ground since Concorde first took to the skies in 1969. Now, the course is set for hypersonic travel - which is anything over five times the speed of sound.
 
After two decades of research, NASA has developed the world's first hypersonic, air-breathing free-flight vehicle, the X-43A. Though still in the testing phase, the Dryden Flight Research Centre believe this 4m long unmanned aircraft is capable of speeds of over Mach 10 - or two miles a second.
 
So how are such speeds possible without the use of rockets? The answer is Scramjets, or supersonic combustible ramjets.
 
The body of the X-43 looks nothing like you imagine an aeroplane to look. In fact, its shape plays a crucial role in the scramjet's air intake and propulsion. The aircraft's underside channels compressed air into the engine and the rear underside helps channel the exhaust out.
 
This technology will eventually enable the X-43A to go from London to Los Angeles in just 45 minutes!