In 2013, the X-47B demonstrated the first ever carrier-based launches and recoveries by an autonomous, low-observable relevant unmanned aircraft.
In April of 2015, the X-47B once again made aviation history by successfully conducting the first ever Autonomous Aerial Refuelling (AAR) of an unmanned aircraft. AAR unlocks the full potential of what an unmanned surveillance, strike and reconnaissance system can do in support of the Navy.
These historical demonstrations solidify the concept of future unmanned aircraft and proved that the X-47B can perform standard missions like aerial refuelling and operate seamlessly with manned aircraft as part of the Carrier Air Wing.
Source: YouTube