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The Air Force says the X-51A Waverider flew at six times the speed of sound for more than 3 minutes yesterday morning after being released from a B-52 off the southern California coast. Its scramjet engine accelerated the vehicle to Mach 6, and it flew autonomously for 200 seconds before losing acceleration. At that point the test was terminated. The Air Force says the previous record for a hypersonic scramjet burn was 12 seconds.