First, this flight was the alternate flight (July 8 2021) because our original flight (AA2535) was suppose to leave San Diego on July 7, 2021 there was not a crew to fly. As a result not only was the flight cancelled but our original seat assignment(9A-9B) was also changed to (16D-16F). We had this trip and tickets for a year, then this occurred , they should not have changed our original seats. we were very disappointed that AA did that!! The seats were just OK for a 3 hour flight, service was great and the aircraft did have an IFE which is a plus, and passed the time away. BEWARE if you have a flight cancellation on AA, your seats, day of travel or time of departure may change. Secondly, we were not notified until 1:00 AM in the morning of the day of travel, our flight was to leave at 6:17 AM!!!!! we were already packed and ready to go to airport!!!!!