I'm flying SEA-SFO tomorrow. According to the website I'm waitlisted for premium class. Looking at the waitlist in the mobile app I see the following:



What's the deal with all the giant gaps between upgrades to Premium Class? I'm at 23, so why did 25, 27, and 28 upgrade ahead of me? I get that upgrades are based on purchase date, fare bucket, etc., but presumably that's how I wound up at 25 in the first place.

The entire upgrade list looks like this with gaps all over the place. What gives?

Neil