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Ninety years ago, a handful of aviators tried out a novel idea: running a gasoline hose from one biplane to another. Higher-tech adaptations of that maneuver keep 21st century aircraft going and going and...
Making its second and third dry runs in the desert, the Northrop Grumman prototype is in the early stages of gearing up for eventual maneuvers on an aircraft carrier.
In a test flight, the big UAV flies close enough to a partner at high altitude to reassure Northrop Grumman that it's on track toward an actual refueling in 2012.