From the earliest days of the U
In 1948, the X-1 became the first supersonic aircraft in the world, traveling faster than the speed of sound. A decade and a half later, in response to the U-2 spy plane being shot down during the Cold War, the SR-71 Blackbird was developed to fly higher and faster than any other aircraft before it, pushing the limit to over Mach 3, or 3 times the speed of sound [3]. ................
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