An unmanned tanker drone successfully refueled a fighter jet in mid-air during a test flight on Friday. The impressive feat, which involved a Navy F/A-18 Super Hornet, demonstrated the significant potential of unmanned tanker drones and could mark the beginning of the end for traditional piloted tanker aircraft. During the test flight, the drone - a Boeing-built device named MQ-25 Stingray - maintained its altitude and speed as the hose extended and the two aircraft briefly linked up to exchange fuel. The test was carried out from the MidAmerica St. Louis Airport in Mascoutah, Illinois. In total, 325lbs of fuel...