American Airlines on Tuesday agreed to buy 20 supersonic jets that can travel at 1,300 miles per hour but are years away from hitting the friendly skies. The Texas-based airline put down a non-refundable deposit for the fleet of Boom Supersonic Overture jets and has the option to buy 40 more.

American Airlines has agreed to buy 20 Boom Supersonic Overture passenger jets, which are expected to carry passengers at twice the speeds of conventional passenger aircraft.

American Airlines has agreed to purchase 20 supersonic Overture planes from Boom Supersonic. The deal is the second firm order in the last two years for Boom. Boom says the Overture jet will fly as fast as Mach 1.7, or 1,304 mph, dramatically cutting trans-Atlantic and trans-Pacific flight times.