American Airlines to Buy 20 Boom Supersonic Jets

American Airlines Group agreed to buy 20 planes from Boom Supersonic, betting on the future of an ultra-fast plane that is still years away.

American put down a nonrefundable deposit on its initial 20 aircraft, known as the Overture, and has the option to purchase 40 more, the companies said Tuesday. The companies didn’t disclose additional financial details of the transaction.