In recent years, numerous pretenders to the throne – supersonic, hypersonic, hydrogen-powered, with anti-boom technology – have been whizzing round, conceptually at least, but many of these projects promising seamless super-fast travel have instead stalled, sputtered out or hit delays.
The Destinus concept is hydrogen-powered flight at five times the speed of sound, cutting flight duration to less than a quarter of current commercial air travel.
Its first two prototypes have made successful test flights and are about to start testing hydrogen-powered flight.
Hydrogen-powered aviation is still in its infancy, with hydrogen jet engines yet to enter commercial use.
The upcoming prototype, Destinus 3, will be supersonic and the hope is for it to achieve supersonic hydrogen-powered flight in 2024.