Originally Posted by
Airplanefanatic
I tried this recently and the elite line told me that it had to be in the same class of service. I'm not sure if this is correct as it seemed a bit off to me.
You don't need to worry. At the 3hr mark, those "fare classes" will appear for confirmed change purposes. If there are open seats, they'll take your $25 and allow you to change. If the flight is fully booked, then they won't. That's all.