"During its final test flight," DARPA said, "two modified Global Hawk aircraft flew in close formation, 100 feet or less between refueling probe and receiver drogue, for the majority of a 2.5-hour engagement at 44,800 feet. This demonstrated for the first time that High Altitude Long Endurance (HALE) class aircraft can safely and autonomously operate under in-flight refueling conditions."
The Navy, meanwhile, had hoped to carry out aerial refueling tests with its X-47B drones in 2014, but it looks now like that will not come to pass.
August 25, 2013 9:14 AM PDT
Photo by: DARPA
| Caption by: Jonathan Skillings
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