A US Air Force refuelling aircraft disappeared off the radar over the English Channel last night. The Boeing KC-135R Stratotanker left Amiens in northern France at 0.05am local time (11.05pm BST) and was last reported on a flight tracking website between Dover and Calais 15 minutes later. It is not yet known why the plane - flying under the code QID72 and based at Mildenhall in Suffolk - fell off the radar at 0.20am. The US Air Force was unavailable for comment.