While en-route to NAS Patuxent River, the X-32 made six refueling stops, as it was not certified for air-to-air refuelings. On 24 June, during the aircraft's 44th flight, O’Donoghue transitioned the X-32B from fully wingborne (conventional) to jetborne (STOVL) flight mode and then smoothly decelerated the X-32B to a steady hover at about 250 feet above the ground.
O'Donoghue then accelerated out of the hover and transitioned back to conventional flight before making a "slow landing." During four other flights the same day, the X-32B completed three additional hovers and numerous transitions to STOVL flight.
In total, the X-32B hovered for eight minutes that day, the single longest sustained hover covering two minutes and 42 seconds.
The final flight of the X-32B test program occurred on July 28, 2001.
The X-32B took to the air for the first time on 29 March 2001, the pilot was Phil O'Donoughe.
The aircraft took-off at 1547 EST, climbed to 30,000 feet and performed a series of supersonic dashes achieving a maximum speed of 1.05 Mach.
UK Royal Navy test pilot Lieutenant Commander Paul Stone, guided the aircraft to touchdown at 1628 EST thus bringing to a close the Boeing flight test program.
Two additional flights took place on 19 December in preparation for commencement of FCLP testing.
The Lockheed Martin JSF team completed installation of the JSF X-35B’s flight-ready propulsion system – including the shaft-driven lift fan and engine – on May 12.
The X-35A CTOL program was completed on 22 November 2000 with all objectives achieved or exceeded.