Originally Posted by
rankourabu
I ve done this with AC three times, changing after sponsored eupgrades clear, if you do it yourself, it's no problems, if u ask an AC agent, they won't know what they are doing, and you ll get credited to AE. Got screwed twice, luckily on short flights.
When you say "...do it yourself..." how are you making the change yourself? Can you still manage your booking at AC.com after the upgrade clears? Please be specific on which steps you took to change the FF# 'yourself'