The XB-70A, built by North American Aviation's Los Angeles Division for the U.S. Air Force, was an experimental high-speed, delta-wing aircraft designed to fly at Mach 3 and at altitudes in excess of 70,000 feet. It was powered by six General Electric J-93 turbojet engines, each producing approximately 30,000 pounds of thrust. Primary purpose of the aircraft was to investigate the feasibility of long-range, high-speed flight and to advance the aeronautical state of the art in those areas. Among its features were a movable canard, the "compression lift" aerodynamic design principle, in-flight accessibility to electronics equipment, a shirt-sleeve environment for the crew, and encapsulated seats for crew ejection at speeds up to Mach 3 and at altitudes to above 70,000 feet.