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The latest new concept design is called Skreemr, which -- if developed -- supposedly would carry 75 passengers from London to New York in 30 minutes

unlike rockets, scramjet engines would burn oxygen from the atmosphere instead of having to carry heavy tanks full of oxygen

A hybrid rocket and jet engine is being developed by Reaction Engines with joint funding by the UK and BAE Systems, which could one day lead to a new supersonic airliner

When Virgin Galactic finally takes its first tourists to space, it'll just be a a stepping stone to what the company's ultimate mission is: Flying people from one place on Earth to another place on Earth, just like any other airline. Except in this version, you'll travel through space and be able to fly from Los Angeles to Tokyo in an hour.

He's discussed creating a supersonic passenger plane himself, but why settle for an incremental change when, if it works, "point-to-point suborbital space transportation" promises to be a complete paradigm shift?

Virgin's daring, sometimes insane chairman Richard Branson has long had his eyes on a supersonic commercial airline