Originally Posted by
Semphyra
On paper you would lose the upgrade, but since you only can change your FFP number at the check-in desk, I believe YMMV
You may still get the upgrade at boarding time
I'm in the situation of potentially wanting to change to a different FFP; how quick is the process to do it at the check-in desk? I know the lines will be unpredictable, but once you get to the counter, is it a request they know to process with little further prompting, or should I expect some difficulty?