Originally Posted by
AndyTLe
At 3 hours before departure, all upgrades become battlefield. At the same time, 3 hours before departure, is when you can begin to SDC. So you won't receive an upgrade immediately if you SDC and will be placed on the upgrade list. Meaning, there is a chance you won't get the upgrade if others ranked above you SDC or purchase tickets that are upgrade eligible.
Where'd you come up with this?
If V inventory remains when you are SDC'd onto a flight, it will
usually upgrade you. If not, the agent should be able to do it.
This is speaking from experience, not hypothesis.