Beth Stevenson: USN X-47B performs dry air refuelling connection. In: Flightglobal.com. 22. April 2015, abgerufen am 22. April 2015 (englisch): „The X-47B engaged with the Omega Boeing K-707 tanker over Chesapeake Bay on 15 April after taking off from NAS Patuxent River in Maryland, but no fuel was transferred, according to the US Naval Air Systems Command.“