I first paid attention to JetBlue’s upgrade list after hitting Mosaic status and wondering why I didn’t always get the seat I hoped for. From what I’ve seen, the list depends on things like status level, fare type, and availability, so it’s not always guaranteed. On one busy travel day, I was pretty high on the list but still didn’t clear because the flight was full. When my plans changed later that trip and I needed to switch flights, I didn’t want to lose my upgrade chances. Calling 8 4 4-7 3 4-0 8 1 3 was the best way to instantly book, cancel, or modify flights and make sure everything stayed straight.