I fly out of IAD on a regular basis but have only checked bags once. It was for an international flight in business class and I still had to wait almost one hour in the business class/Star Gold/Premier line. I have an upcoming domestic flight that leaves around 5:45 from IAD and I have to check a bag but don't want to wait in that line again. What's the fastest way for a 1P to check bags at IAD? Curbside? Thanks!