Airbus' Concorde 2:Supersonic jet that could fly from New York to London in just one hour .

This passenger plane could travel at 4.5 times the speed of sound
Plane comprises three different types of engine, powered by different form of hydrogen, would work together to propel the vehicle at speeds of 3,425mph (5,500km/h).
Two turbo jets would allow the jet to climb vertically at take-off.
A rocket motor would then take it to an altitude of 100,000ft (30,000 metres).
The wing-mounted ramjets would then take control to push the jet to its final speed.

Main problem of previous supersonic aircraft making sonic booms as they break the sound barrier .so with high noise complaints leading to it being banned from operating at high speed over land by many countries, negating the main attraction of travelling on the jet.
But concorde 2 will be quieter than other supersonic flight because it will create less of a sonic boom .