MIA has a new AC in the D terminal, inside security, which IMHO is better than the one outside security in E. Also, any day now (maybe ) AA is promising to open the doors to a very new A terminal AC, and when and if that happens, the E club will be no more.

Also, there is a BA Terraces club in terminal A but access may/may not happen according to the wishes of the BA dragons at the door, unless of course you fly the world's favourite airline (do a search on the AA forum, it's a mix of success at best, but definitely leaning towards refusal when flying other OW airlines)