Not to be rude or anything, but in watching the aircraft rotation, it is very safe to say 784 will pass thru Seattle at least once a day. With the exception of our -200s, this could be said about the entire fleet.
Heck one day here in ANC
784 passed thru 4 times, doing various turns in the state....Yes you have to smile when you see it, its an amazing bird...
You can take the pup out of Alaska, but you can't take the Alaska out of the pup.