I was departinf to SFO this morning, and while sitting in the area netween the D and E gates, I watched NW's early morning arrival of flt. 6 from NRT.
Down by the D gates, where intl. fligts operate, I noticed that there's a separate security screening area for inbound passengers that accesses the D pier. I'm wondering what the purpose of this is considering that I also saw buses that said "International Arrivals Bus" ferrying pax between the aircraft to some unseen locatio (presumably immigration and customs).
What exactly is the arrivals procedur efor intl. flights at PDX?