WASHINGTON, May 6:Boeing Co’s X-51A Waverider made history this week when it achieved the longest hypersonic flight by a jet-fuel powered aircraft, flying for 3-1/2 minutes at five times the speed of sound, the U.S. Air Force said on Friday. The last of four unmanned experimental military aircraft built by Boeing flew for at a top speed of Mach 5.1 over the Pacific Ocean on May 1, the Air Force said. The total flight covered 230 nautical miles in just over six minutes before the hypersonic cruiser plunged into the ocean. (agencies)
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