ExpertFlyer will give you the delay details. Your flight is indeed delayed due to crew.

I would for sure keep an eye on it tonight and early tomorrow morning. Not sure which crew would be working your PHX flight, but both of the incoming A320 flights tonight into STL (from DFW and PHX) are only showing minor sub 30 min delays. So if those flights arrive closer to on-time AA might possibly move the time up of your flight.