Boeing’s 2707 supersonic airliner was canceled in 1971. NASA’s High-Speed Research program was terminated in 1999. The Anglo-French Concorde was retired in 2003. Even the not-quite-supersonic Boeing Sonic Cruiser got scrubbed in 2001. The trajectory of supersonic travel has been downward in recent decades. But now entrepreneurs and startups see an opportunity to disrupt the market with small high-speed aircraft. Richard Branson once offered to buy British Airways’ ...

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