The era of supersonic commercial flights came to an end when the Concorde completed its last trip between New York and London in 2003, but the allure of ultrafast air travel never quite died out.
President Biden mused about supersonic flights when discussing his infrastructure plan in April. And on Thursday, United Airlines said it was ordering 15 jets that can travel faster than the speed of sound from Boom Supersonic, a start-up in Denver. The airline said it had an option to increase its order by up to 35 planes.