Originally Posted by
eponymous_coward
(If anything is going to hurt AS in SEA, it's losing DL longhaul. That's an ouch right there. If you do a lot of longhaul travel out of SEA and credit the DL flights to AS, it's going to be very tempting to just go to DL.)
If by long haul you mean transpacific flights out of SEA, there're plenty of competition to DL: JL, HU, KE, NH, MU, MF, BR, CI with the first three being AS partners.