My STL-DFW, LHR-DFW, and DFW-STL flight times all changed (no seat displacement-yet ) this week. Nothing disruptive or warranting a free change, but I was surprised when both the web site and the Android app notified me that there was a schedule change when I clicked onto the reservations. I appreciate the automated heads-up.

IIRC, I only got the phone call if the schedule change was major and screwed up a connection or something. I still remember the "Oh by the way, we changed your flight tomorrow to depart three hours earlier, before your meeting ends, and it's the last flight you can connect home on" notification I received from AA once.