Originally Posted by
FlyinHawaiian
I suspect you will be responsible for payment of the co-pay fee, but they would accept and charge your friend's credit card (assuming you are together at check in).
Interesting. How about it if I upgrade a friend with miles but I'm not traveling, thus I'm not checking-in.... Then, in that case, they'd have to charge the friend/one receiving the upgrade. Seems inconsistent.