Originally Posted by
flymonthly
You can look at the "complete" upgrade list (those who are eligible even if they aren't checked in) around T-48 (or sometimes earlier, I think) if you go to
https://www.alaskaair.com/status/ffff/yyyy-mm-dd using a browser - replace the ffff with the flight # and yyyy-mm-dd with the date. I believe pax still fall off the upgrade list when they are upgraded, but if you take a screenshot at the t-48 mark, you would see who was there at that point.
This is amazing. I never knew a tool like this existed.