I learned how Delta upgrade certificates work after earning one through Medallion status and honestly not knowing the best way to use it at first. I had already booked a Main Cabin flight and later realized I could apply the certificate to move up a cabin, depending on availability. It didn’t clear right away, which made me nervous, especially when my travel dates changed. I ended up needing help reapplying it to a new flight. Calling 8 8 8-2 1 7-3 3 2 4 was the easiest way to instantly book, cancel, or modify flights and make sure the certificate didn’t go to waste.
