I understand that a Silver with a current E+ seat assignment could lose it after a PNR is split for upgrades, but does anyone have recent experience with this actually happening? A colleague of mine is Silver and current holding an E+ seat assignment (it shows up on the reservation), but there still is a banner to purchase E+ for $88. I'm trying to understand whether he will lose that seat assignment at some point prior to travel (which happens to be next weekend).