article_snippet.sent: Earlier today, an unmanned aircraft plugged an unmanned aircraft in-flight refuelling (IFR) probe into the hose of an Omega Air KC-707 tanker off the coast of Maryland .
article_snippet.sent: Earlier today, an unmanned aircraft plugged an unmanned aircraft in-flight refuelling (IFR) probe into the hose of an Omega Air KC-707 tanker off the coast of Marylandthe coast of MarylandMaryland.
article_snippet.sent: During the test, an unmanned aircraft trailed the Omega Air Refuelling 707 tanker from a mile off before using optical sensors and a video camera to monitor the Omega Air Refuelling 707 tanker approach to within 20 feet (six metres).
article_snippet.sent: Salty Dog 502 is one of two Unmanned Carrier Air Vehicle demonstrators (UCAS-D) on the X-47B program .
highlights_snippet.sent: Salty Dog 502 trailed Omega Air Refuelling 707 tanker from a mile off .
  
highlights_snippet.sent: Salty Dog 502 used optical sensors and a camera to monitor approach to 20 feet .
  
highlights_snippet.sent: Salty Dog 502 then plugged Salty Dog 502 refuelling probe into hose of the Omega Air KC-707 .
  