The Saint S4 E13 Flight Plan (1966) Roger Moore, William Gaunt, Fiona Lewis

The Osprey is a new experimental plane and was being testflown by Flight Lieutenant Mike Gregory until his recent courtmartial. Now Middle Eastern agents are using Mike to steal the plane, kidnapping his sister Diane. Having rescued Diane, the Saint goes after Mike, getting himself parachuted into unknown territory to fly the Osprey home.