One of two initial U.S. Air Force SR-71A reconnaissance aircraft that was retired from operational service and loaned to NASA for high-speed research programs arrives at NASA's Dryden Flight Research Center, Edwards, California. The aircraft deployed its drag chute even before its nose gear touches the runway at the end of a 1990 research flight. Dryden flew three YF-12 aircraft, prototypes of the triple-sonic SR-71s, in an earlier supersonic research program between 1969 and 1979.