Originally Posted by
azeckel
2) Same day confirmed is confirmed. Yes. And you are back on the upgrade list. The only thing that I can think of is if you cut something crazy close and did a change < 1 hour to departure (not sure if they'd even allow it, but maybe you showed up at LGA by mistake and convinced them to switch you). In which case maybe the upgrade list would have already cleared...
IME you aren't always added to the upgrade list, so it's prudent to double check afterward.