LAS VEGAS — Northrop Grumman has completed close-formation flight tests with two RQ-4 Global Hawk unmanned aircraft as it moves closer to an autonomous high-altitude aerial refueling demonstration for the U.S. Defense Advanced Research Projects Agency (Darpa) under the KQ-X program. Two NASA-owned Global Hawks completed the flights on June 30, with the receiver ahead of the tanker in a reversal of normal hose-and-drogue aerial refueling. The receiver aircraft, equipped with a hose ...

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