I am curious if others have experienced this, I have gotten Comfort+ seats on 3 different flights because those were the only open seats available when I checked in. I didn't get any additional miles or anything but still. Another 3-4 flights, I was assigned "preferred" seats (not the best seats but still). I don't allow the app to check me in automatically and wait until I have arrived at the airport. It hasn't happened every time but I am just wondering if others have had this happen to them.