Flexjet signed a firm order today at NBAA 2015 for 20 Aerion AS2 supersonic business jets for delivery beginning in 2023.

The Aerion AS2 is a supersonic business jet designed by Aerion Corporation in collaboration with Airbus, scheduled to enter service in 2023^. The aircraft was first announced during September 2014, with test flights expected to commence in 2019. The unit cost is estimated to be US$120 million.

The AS2 will fly at a speed of Mach 1.5, using supersonic laminar flow technology, and the wing design will allow for lighter fuel consumption and increased travel ranges by reducing aerodynamic drag by 20%. The cabin is designed to accommodate up to 12 passengers. NASA has issued a contract to model supersonic boom on ground. New noise regulations coming in 2020 caused Aerion to change design from 2 to 3 engines.