Originally Posted by
joshwex90
If you had flown already, you wouldn't have been able to buy-up. Since you haven't, it's irrelevant.
Agreed. But wouldn't that entail a penalty?
Yes -- which is why if he doesn't have any CO miles to waitlist he's possibly SOL. Might find an agent who will wave the change fee if he's just repurchasing the same itinerary in BF from Y, but not guaranteed.