In March 1960 the Curtiss-Wright Corporation developed the X-100, a prototype for a new, vertical take-off transport aircraft. The X-100 had a single turboshaft engine, which propelled two tilting-rotors, while at the tail swivelling nozzles used the engine's exhaust gases to give additional control in hovering or slow flight.
From the X-100 Curtiss-Wright developed the larger X-200, of which the United States Air Force ordered two prototypes designated the X-19A.
The first flight of the X-19 took place in November 1963 (other sources give 26 June 1964). It was intended that the X-19 would be developed into a VTOL transport aircraft. However the first X-19 was destroyed in a crash on 25 August 1965, and the program was subsequently cancelled.