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The Boeing X-51 WaveRider is an unmanned scramjet aircraft for hypersonic (Mach 6, approximately 4,000 miles per hour at altitude) flight testing. It completed a 6-minute flight and reached speeds of over Mach 5 for 210 seconds on May 1, 2013 for the longest duration hypersonic flight. The aircraft has been nicknamed „WaveRider“ because it uses its shock waves to add compression lift.