We are flying into IAD from CPH on SAS. Our itinerary continues with a UA flight, but we were not issued a boarding pass for the UA flight at our origin. They said it had to be obtained at Dulles and our luggage is only checked as far as Dulles. The IAD website indicates that we will be processed through customs in the C concourse, but is that where our luggage will be? If it is only tagged for Dulles and not for our final destination, will it go to IAB? And where will we check in for the UA flight and get boarding passes? Is it possible to do this without going to the United ticket counter in the Main Terminal?