Sammy, Miami's D Concourse is literally 1.2 miles long, with 51 gates and a Skytrain with 4 stops. AA has the entire D Concourse, as well as gates in the E Concourse. The E concourse has two sets of gates, High E and Low E, which are connected by a train. The question is, where do you arrive, and where do you depart? Sound appealing?

I agree regarding AA at PHL. I've been lucky the last two times I transited there, but everything prior to that was a cluster.