What was expected to be a routine stopover at Bangor International Airport for a plane filled with returning U.S. troops and defense contractors Sunday night instead became a frustrating ordeal for many of those aboard. For the 102 U.S. troops returning from Afghanistan and Kuwait on Delta flight 8964, getting off the plane was fairly routine and featured a hero’s welcome from the Maine Troop Greeters in attendance. It was a different story for the 112 Department of Defense contractors — those hired to fly drones, do intelligence analysis, fix computers and other jobs — some of whom were kept...