The USAF and NASA subsequently retired their aircraft ... mechanisms were required for the aircraft. The Lockheed SR-71 Blackbird is retired and being relpaced by the SR-72 UAV.

NASA released video footage of the SR-71 Blackbird, the high-altitude recon aircraft capable of reaching speeds over Mach 3. More from Military & Defense NASA released video footage of the SR-71 ...

The NASA X-43 is an experimental unmanned aircraft ... The second spot on the list goes to another remarkable machine: the Lockheed SR-71 Blackbird. Introduced into the United States Air Force ...

The Lockheed SR-71 Blackbird was developed as a faster and ... Air Force and the National Aeronautics and Space Administration (NASA). The aircraft, which was developed from a number of other ...