I made the reservation on the AS site, but it wouldn't let me check in right now. I wonder if it's because it's a multi-city flight (SFO-LAX-SEA). I'll try checking in tomorrow morning when it's T-24 from the LAX-SEA portion.

Also, funny thing just happened. I SDC my SEA-SFO flight (I booked that flight separately for reasons), so I'm on AS 320. It let me change to that flight no problem. Immediately after I made the change and checked in, I got an email from Alaska requesting volunteers to take a different flight, offering a $250 voucher. I hope this doesn't mean I get involuntarily bumped and miss the party, although I guess I can always cancel the SFO-LAX-SEA flight and get all of that credited to my wallet.