I'm a new executive platinum and still getting used to how things work. I have a saturday flight booked, DFW-ORD at 12:35 for my wife and I. Plans have changed, and I'd now be happy to go in earlier Saturday or even Friday afternoon/night. Although not if it hurts our chances to be upgraded. First of all, I assume "same-day" standby can't be stretched into "24 hour" standby, so we wouldn't be able to fly out Friday without paying to change or flights, is that correct? Secondly, what has anyones experience been of standing by for an earlier flight as far as upgrades go? Is it basically the same as if you booked the earlier flight originally, especially as exec plat? Or do they upgrade everyone else, assign all seats, etc, before processing standby? Would it even be hard to get seats together in coach, let alone upgrades? Thank you!