Originally Posted by
tom911
I've not tried that so don't have the answer. I think your biggest risk may be that they clear the upgrade list before they clear the standby list, and if there's no upgrade seats left you'll be riding in coach after you clear the standby list.
Yes, but that's not a risk, because when you clear the standby list, you don't get taken off your original flight until you actually board the new flight. So if I don't like my seat/don't get upgraded, I simply don't board.