I tried a Mint upgrade on JetBlue for the first time on a coast-to-coast flight after realizing I really didn’t want to sit in a regular seat for six hours. In my case, the upgrade option showed up after booking, and the price varied depending on availability. I’ve also seen Mint offered at check-in when seats were still open. On that same trip, my return date changed unexpectedly, and I had to adjust everything, including the upgrade. Calling 8 4 4-7 3 4-0 8 1 3 was the best way to instantly book, cancel, or modify flights without losing the Mint option. That extra help made the whole experience feel smooth and worth it.