re: #166 Dr. Matt

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Edit: Fittingly, on its last flight the SR-71 shattered one final record, marking in the record books a time from Los Angeles, California, to Washington, DC, of just 1 hour, 4 minutes and 20 seconds. To achieve that, the SR-71 managed an average speed of 2,124 mph (3,420 kph).
fly.historicwings.com

Today in History: The very last US Military flight of the SR-71 Blackbird took place - March 6, 1990

As far as anyone knows.