The airline has paid a non-refundable deposit on the initial 20 aircraft and Overture is expected to carry passengers at twice the speed of today’s fastest commercial aircraft.

Under the agreement, Boom must meet industry-standard operating, performance and safety requirements as well as American’s other conditions before delivery of any Overtures.

"Looking to the future, supersonic travel will be an important part of our ability to deliver for our customers," said Derek Kerr, American’s chief financial officer. "We are excited about how Boom will shape the future of travel both for our company and our customers."

Overture is being designed to carry 65 to 80 passengers at Mach 1.7 over water — or twice the speed of today’s fastest commercial aircraft — with a range of 4,250 nautical miles.

Overture is also being designed to fly more than 600 routes around the world in as little as half the time  – flying from Miami to London in under five hours and Los Angeles to Honolulu in three hours.

In July, Boom revealed the final production design of Overture, which is slated to roll out in 2025 and carry its first passengers by 2029.