FASTER? PLEASE! United Airlines is buying 15 supersonic aircraft from Boom Supersonic.

United Airlines has agreed to purchase 15 supersonic aircraft from Boom Supersonic, with an option to increase that order to 50 jets, the companies announced Thursday. That agreement, though, is still subject to change depending on the outcome of United’s safety testing and also Boom’s ability to deliver on its promises despite never having built or flown a full-scale supersonic jet before.

If Boom’s Overture jets pass inspection, the plan is for them to be rolled out in 2025, fly in 2026, and expected to carry passengers by 2029.

That’s a lot of ifs, depends, and expectations, but it will be at least interesting to watch how it pans out.