Originally Posted by
paperwastage
IAD is somewhat special due to the midfield terminal immigration. Was there a time where midfield immigration didn't exist, and it behaved like any other airport (everyone has to go thru normal customs/immigration, pick up bags, then either exit airport or recheck for next flight)
IAD has that also, if you're flying in on an airline that uses the A terminal. It's just the *A flights that go to midfield.
Originally Posted by
paperwastage
That saying, MIA has I-I transit without having to touch bags, they could extend I-I to more airports, or even for I-D, given your comments about the new customs/immigration workflow
Houston also has I-I transit without touching your bags. (As does Guam, but that's a bit of a special case because Guam has special immigration and customs rules).