During these typically "slower" months of January and February, I'm consistently seeing PC and FC fuller weeks in-advance regardless of route. Even a non-SEA or hub route like LAS-PVR is 100% full in FC on my flight in January weeks before the first elite upgrade window opens. I know AS is likely doing a better job of selling F on the app but it just seems more noticeable lately on these low season flights I've been booking. As a side note, I'm always surprised to see people pay for or select for free with elite status middle PC seats when there are plenty of windows and aisles available elsewhere including the exit rows.