Originally Posted by Uncle Nonny

So...I got upgraded at T-100 (LAS-LAX on 10/25). I selected my seat in the F cabin shortly after getting the email. I went to check in today and was notified on the APP that my seat will be assigned at the gate. website said the same thing. Called AA and the agent told me it wasn't oversold and that I was upgraded and that I do nneed to see the gate agent for a seat assignment. What would cause this?