The Boeing Model 908-909 was a prototype single engine supersonic multirole fighter aircraft originally developed for the United States Air Force Lightweight Fighter program, a program that later developed into the Air Combat Fighter (ACF) program.
It was initially the favoured design but lost at the conclusion of the competition to the General Dynamics 401, later the YF-16 (now Lockheed F-16).
Among the Boeing Model 908-909 features include a frameless bubble canopy for better visibility and a Pratt & Whitney F100 turbofan engine.
Wind tunnel tests were conducted at the Langley Research Centre as Test 281.
The Lightweight Fighter proposals were delivered to the Air Force by the February 18, 1972 deadline.
The Boeing Model 908-909 was the winner of a preliminary analysis and that was it !
It was not chosen for production as the other competitors entries were much cheaper to produce and maintain.