Lockheed SR-71 Blackbird – Wikipediahttps://en.wikipedia.org › wiki › Lockheed_SR-71_Blac…The Lockheed SR–71 “Blackbird” is a long-range, high-altitude, Mach 3+ strategic reconnaissance aircraft developed and manufactured by the American aerospace company Lockheed Corporation. It was operated by both the United States Air Force (USAF) and NASA.First flight: 22 December 1964Retired: 1998 (USAF), 1999 (NASA)Number built: 32Designer: Clarence “Kelly” Johnson
