Does anybody know when Delta stops changing planes (smaller plane to a bigger plane), flight times, etc. This morning, I logged in to check AGAIN that our seats were still the same so that we can all sit together and once again, for the 5TH TIME, I have had to reselect all of our seats so that we are not split up. I am so sick of doing this. From what I can tell, the type of plane changed this time to a bigger plane. Last time I had to do this it was because the flight time changed by 4 minutes. Is there a cut off date as it gets closer to departure date when they will stop doing this????