Sep 12, 2013
US Navy begins unmanned refuelling trials
For the refuelling trials, software from the Northrop Grumman X-47B was uploaded to a manned surrogate aircraft, a contractor-flown Learjet 25B, refueling from a Boeing 707. Though a pilot was on board the Learjet, the aircraft flew autonomously.
Surrogates are often used as stand-ins for unmanned aircraft, especially on the X-47B programme, which has used both the Learjet and a surrogate Boeing F/A-18.
Testing began on 28 August, flying out of Niagara Falls, New York.