X-32 Joint Strike Fighter JSFX 32 Joint Strike Fighter airplane model. The Boeing X 32 was a multi purpose jet fighter in the Joint Strike Fighter contest. It lost to the Lockheed Martin X 35 demonstrator, which was further developed into the F 35 Lightning II. In September 2000 the X 32A made its first flight, and it made a total of 66 flights during four months of testing. The flights demonstrated the aircraft's handling qualities for inflight refueling, weapons bay operations