The real future of supersonic flight doesn't depend on Richard Branson - but it might depend on Trump

Sir Richard Branson wants to bring back supersonic travel. Thirteen years since Concorde ended operations, the Virgin tycoon has revealed the prototype design for a new generation of supersonic business jets developed by the Branson-backed startup company Boom, based in Denver. The firm claims its planes will allow "affordable" journeys from London to New York in just three-and-a-half hours for approximately $5,000 (£4,000) return, the same as current business class tickets.