NASA’s fleet

Clockwise, starting at left: The Rockwell-Messerschmitt-Bölkow-Blohm X-31, McDonnell Douglas F-15 STOL/MTD (Short Takeoff and Landing/Maneuver Technology Demonstrator), Lockheed’s SR-71, Convair F-106, General Dynamics F-16XL, X-38 lifting body, a radio-controlled mothership, and the McDonnell Douglass X-36