sentences:  General Yeager's flight of the Bell XS-1 through the sound barrier in 1947 is reviewed, along with other X-planes, culminating in the incredible North American X-15 hypersonic research aircraft.Thereafter the conclusion of the film details the flight performance and pilots of the Lockheed SR-71, concluding with high speed conceptions of future air-travel, particularly the National Aerospace Plane and HOTOL.Broadcast,
  
  The film opens with a dazzling display by the Boeing AH-64 Apache gunship helicopter, accompanied by dramatic classical choral music.