If you have a flight coming up on the A320, be sure to watch to seat maps carefully. DL has been removing the last row of FC and canceling all seat assignments on the map, even though your itinerary may indicate that your seat assignment is unchanged. Be sure to click to see the seat map. Do not trust the seat assignment on your itinerary. You might want to double-check by attempting a dummy booking on your flights. I have an A320 flight next week and was upgraded at my DM window. I was automatically assigned an aisle seat but it was in row 4. Last night all looked well but I was thinking of voluntarily putting myself into a window seat in order to be more protected if the configuration were to be changed at the last minute. Today my itinerary continued to show the same seat assignment, but when I looked at the seat map, there was no row 4 in FC. All FC seat assignments were cancelled overnight according to the map and I was able to select a seat that previously had been assigned to someone before the upgrade window. (There were fewer than twelve folks confirmed in FC, so there currently is space for all, but I managed to bag my favorite aisle seat now.) In addition, all coach seats were cancelled last night. What was a full flight now appears completely open with only one assigned coach seat and lots of windows and aisles available to nonelites.