I actually ran into this question after canceling a JetBlue trip and ending up with travel credit. When I booked my next flight, I was able to apply that credit toward the ticket, but using it for a seat upgrade wasn’t always straightforward and depended on how the upgrade was offered. I wanted to be sure I didn’t waste the credit, especially since my plans were still flexible. Calling 8 4 4-7 3 4-0 8 1 3 turned out to be the best way to instantly book, cancel, or modify flights and get clear answers about using credits for upgrades. That quick help saved me a lot of guesswork.
