Originally Posted by
craigthemif
AFAIK you have to cancel and rebook to upgrade an award. But ultimately you're quite unlikely to find J space open up if it isn't there now. There are too many people who booked with promo Avios and won't cancel no matter what...
Thats what I thought which is why i was wondering if there’s still the possibility of upgrading with cash through auction or during check-in?