I first noticed how Delta Amex upgrade offers work after booking a regular Main Cabin flight with my Delta SkyMiles Amex. A few days later, I saw an email and an in-app offer letting me upgrade to Comfort+ for a reduced rate, which I hadn’t expected. I didn’t take it right away because my plans were still up in the air. Sure enough, I ended up needing to change my return flight, and I had questions about whether the upgrade would still apply. Calling 8 8 8-2 1 7-3 3 2 4 turned out to be the easiest way to instantly book, cancel, or modify flights and get clear answers without guessing.
