Hi- I am flying to Las Vegas Tomorrow confirmed AC 593. I wanted to stand by to AC 591. I forgot the "same day" part of same day standby- and I used the web check in a few minutes ago.

Any chance I can "re-check in" and get on the earlier flight after midnight (i.e. same-day?) Or do I have to press my luck at the airport? Any help would be much appreciated.

MP