I can attest to this having worked for AA. The communication is in fact bad. In my GA days there is more than once I walked up to ask the crew if they knew the flight was cxld as they were busy with their pre-flight. They always looked confused as heck and had to call company and find out themselves sure enough. Not to mention the numerous times a crew came strolling in unaware of a 2hr ATC delay that was posted.

The regionals are the worst though. A lot of times you will have X contract worker working a flight with Y regional pilots etc.

Heck back in the day when I had to deal with delayed pax with connections, I would have to go back myself and trace their connection being delayed bc it would still show on-time. If I went by the system a lot of times I would be taking them off a connection they actually would make because of that one's delay too.