Is superfast really better? An airliner that can reach six times the speed of sound is being made, but some worry that it is not good news for the planet.
2030 forecast: travel goes hypersonic
Whizz kid: Venus Aerospace's Stargazer is powered by a rotating-detonation engine that spins at 20,000 rotations per second. Glossary
Miles - A unit of distance. One mile is roughly 1.6 kilometres.
Hypersonic - Travelling at speeds of more than five times the speed of sound (Mach 5).
Sonic boom - A loud explosive sound caused by shockwaves created when an object travels faster than the speed of sound.
Nasa - The National Aeronautics and Space Administration, responsible for the US space programme.
Pilot - A small-scale trial to find out whether a treatment works outside of the laboratory.
London - The capital city of the United Kingdom. It has a total population of 14 million.
Scotland - A country that is part of the United Kingdom. It covers the northern part of the island of Great Britain.