The Boeing Joint Strike Fighter X-32B concept demonstrator completed significant flight-test accomplishments June 19 and 20 in 2001 that paved the way for an important program milestone; hover. In four flights each day, the X-32B demonstrated rock-solid stability at various altitudes and airspeeds, and transitioned from conventional to short-takeoff-and-vertical-landing (STOVL) flight mode and back again numerous times. The eight flights culminated in "slow" landings, in which the pilot transitioned to the lift nozzles and STOVL mode for approach and landing down to 90 knots.