American Airlines announced Tuesday that the company has placed a deposit on a fleet of supersonic airliners that could carry passengers from London to New York in three hours. The world’s largest airline placed a nonrefundable deposit for 20 Overture supersonic aircraft from manufacturer Boom Supersonic. Boom plans to complete its final design of the Overture aircraft by 2025, and is targeting 2029 for the first flights carrying passengers. “Looking to the future, supersonic travel will be an important part of our ability to deliver for our customers,” American’s chief financial officer Derek Kerr said in a statement. Neither American Airlines nor Boom revealed the amount of the deposit laid down by the airline, but the airline is not alone; in 2021, United Airlines placed a deposit for 15 of the supersonic airliners. At that time, United compared the likely cost of the Overture aircraft to a Boeing 787 Dreamliner, which ranges from $248m (£205m) to $338m. Boom claims the Overture aircraft will carry up to 80 passengers over a range of 4,250 nautical miles at a cruising speed of Mach 1.7, or 1.7 times the speed of sound. The last supersonic airliner to see regular service, the Concorde, flew at Mach 2.04, and could make the Atlantic crossing from London to New York in just under three hours.