American Airlines orders 20 supersonic jets.

American Airlines has agreed to buy up to 20 supersonic jets and put down a non refundable deposit.

There is a contract that neither America nor Boom supersonic would provide financial details.

America becomes the second largest customer for Boom after America's 40 more Boom Overture planes buying orders.

Boom CEO Scholl said his company's plane will be different when it debuts in 2029.

Boom added that its plane will have a top speed of 1.7 times the speed of sound.

One important thing is that Boom does not yet have a engine manufacturer lined up. It is talking with Rolls Royce and others.

These plane will fly entirely on sustainable aviation fuels.