Originally Posted by
Psyduck1
You'll see GUC upgrades for D1 on the list if any are still pending. I think C+ upgrades are just rare outside of PM+ clearing on ticketing, but they do exist.
If you are on an AF-coded DL flight, there is no way to be upgraded to C+ other than on day of -departure. The system simply won't allow it or process it. The flight must be DL coded so that it can be exchanged for SU class (the upgrade bucket for C+) due to C+ being a separate fare class.