F-35B goes supersonic Posted on June 15, 2010 by alert5 BF-2 became the first F-35B to go supersonic on Jun. 10 by accelerating to to Mach 1.07. Related posts (Automatically Generated): Boeing, Air Force Research Lab, Pratt & Whitney Rocketdyne to Conduct X-51A WaveRider Flight Test on May 25 Boeing patents supersonic inlet design X-51A flies, for 140 seconds only