Originally Posted by
rylan
Agreed, mileage upgrades for intl should go to the gate list. They can code certs to get used when an upgrade clears at the gate, so why not miles?
I think part of it is that a GUC is in a ready exchangeable form for processing the new ticket. Miles involves having the miles pulled, and a certificate created that can then be used to exchange for new ticket.
Still should be possible, but I at least understand why it's not the same as a GUC.