US Air Force B-52 bombers were spotted overhead this morning heading for RAF Fairford.
A C5 Galaxy military transporter plane arriving early this morning, packed with US air crew and supplies.
Following that, four B-52s set off from their Minot Air Base around 2am GMT, with a brief refuelling over Nova Scotia before making their way over the Atlantic.
One of the huge bombers was spotted just before 11am over the Dee Estuary before passing close to the Wales, England border.