Originally Posted by
fumje
You were receiving exceptions, then. Those are not generally allowed changes (for no fee / fare difference), and the agents' replies you mentioned earlier (need to pay fare diff, wait 40 minutes, etc.) are appropriate.
just got another flight changed 🤷
"Upon checking, ... Premier members are eligible to make a confirmed change on another flight at no cost if original ticketed fare class is available. I was able to get the same booking class which is 'L' for you. The change is successful... I waived the fare difference for you."