Originally Posted by
NOLAnwGOLD
I think if it's AF/KL ticketed, it has to be the higher classes YBM equivalent to use the upgrade certificates. Maybe there's a work around but I've learned best to do DL ticketed everything if you want to use the RUC/GUCs.
I usually just try to do everything in one phone call, purchasing flights where upgrade space is available. If the agent seems competent, I let him/her worry about exactly how to book the flights and issue the ticket. Then I carefully inspect itineraries and receipts. Trust but verify.