Originally Posted by
jlo13
I figured as much based on this thread, but that doesn’t really answer my question

Are you saying just to wait until I get an email to check in?
sorry. Just coming back to the thread. I realize your flight has passed but for future reference for others. It does not matter if you are checked in. They will change the electronic boarding pass to reflect the upgrade so you can check in 24 hours prior and it will not impact your upgrade.