Multiple times now I've had something odd happen when using 500 mile sticker upgrades on American. Currently she has gold status and we always request an upgrade when booking, usually far in advance of travel. We've had pretty good luck on our upgrades, but many times are upgraded to not sitting together...even when side by side seats are together! For example, this morning I checked the seats available in first and saw 3E, 3F, and 6F available for our flight this afternoon. A few hours later we received an email telling us of the upgrade. Her to 3E and me to 6F. I looked and saw 3F was still available, but wasn't able to change it on-line. I called in and they weren't able to change it since I had checked in online the night before. I was able to change easily at the airport, but I feel like I must be doing something wrong. Why wouldn't AA put two upgraded passengers, booked together, traveling together in coach, together when possible? Thanks for any insight!