BTX-1 N381TX (c/n 00001) with the landing gear extended. Boeing has not specified the landing gear used by the BTX-1 model; visually it resembles the system used by the F-16 Fighting Falcon.

BTX-1 N381TX on an early test flight from St Louis-Lambert Field.

Both BTX-1 aircraft flew together for the first time on April, 27, 2017.

Boeing's first BTX-1 takes off from the runway at St Louis-Lambert Field in full afterburner. The GE F404-GE-402 engine has a thrust class rating of 17,700 to 18,100lb.