I booked a NW ticket, and when returning, I fly HKG to NRT to SEA to LAX. I get into SEA at 8:00am, and depart 10:08am. Is the 2 hours and 8 minutes enough for customs? Does NW in NRT check me in for the AS portion (NW codeshare) from SEA to LAX? Does NW have an interline baggage agreement with AS so that I won't have to reclaim my bags in SEA?

Any help people can provide is most appreciated. Thanks!