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" ... They also have drawn lessons from the Northrop Grumman RQ-4 Global Hawk, the Air Force drone that comes closest to matching the sensor performance of the U-2S. Global Hawk has impressive endurance, with a typical mission averaging 20 hours in the air, so the Skunk Works has incorporated similar persistence in their TR-X. But TR-X would be refuelable in flight, giving it longer legs than the RQ-4 when needed. ... "