Originally Posted by
flyerCO
DL could rebalidate the ticket. However they can only do this DoD at airport. Thus yes can upgrade, but can only be done at airport DoD. DL can do an AF/KL ticket as they have ability to reissue the ticket. VA they they dont have ability to reissue, just revalidate.
This is why I said "from the waitlist" in my post. I suspect that getting the upgrade from an airport standby list (and even being added to the standby list for the upgrade) will depend on the GA, just like some GAs are willing do process upgrades with miles at the gate if there's time and they know how to pull miles.