Originally Posted by
galaxygrrl
I called Delta about this one day. For silver is when you check in online. So, check in as soon as you can. Since I started doing this, I'm always first on the list for Silver. It's been awesome!
I don't know about gold and platinum.
Whoever told you this information is flat out WRONG. As posted above, the criteria is determined by Medallion Level, Fare Class and Time of Request (of upgrade). Your check-in time is NOT a factor.