It'll be interesting to see how this works, i too thought RIC would be the logical choice, especially with all the US Air flying they lost, this could compensate a little, and allow them to get a piece of the american flying. As far being DH'd on mainline, they do it when they "need" to. When they start DH you on United to fly American however, that WILL get codeshares a little upset.
Wonder if they'll just start sending crews to hang out in a MIA hotel and wait for trips, or fly whats there plus reserve coverage...hmmm, could be interesting.