LOS ANGELES—Northrop Grumman is using an X-47B unmanned air vehicle (UAV) as a flying testbed for air refueling systems in support of its proposal for the U.S. Navy’s upcoming MQ-25A Stingray unmanned aerial refueling tanker contest. First details of Northrop Grumman’s preparations for the MQ-25A bid have emerged in photographs obtained by Aviation Week of a modified X-47B at the U.S. Air Force’s Plant 42 facility in Palmdale, California. The photos appear to show ...

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