I have that checked in my profile with AA but I don't actually remember getting any such alerts. Although we almost always do the nonstop from Miami and there are very few changes on that route.

In a somewhat related note, people talk badly about Frontier all the time, but they changed my flight to Indiana in May by half an hour and I got THREE email notifications from them that the schedule had changed. One would think that AA could send at least one email with any schedule change, especially ones like are being described here, regardless of whether you put it in your profile or not. Just sayin'...