This Quiet Supersonic Transport (QSST) concept is the A2 hypersonic plane designed by Reaction Engines of the U.K. It will carry 300 passengers and reach speeds of up to 4,000 mph. It will run on liquid hydrogen and could fly between England and Australia in less than 5 hours. A production model won't be available for 25 years.
Twenty five years is a long time, they could speed up progress, however, if they consider entering into a joint venture agreement with a company like Birkshire Hathaway.
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