Yes, AA still flies daily to LGW, and flew to ORY when they had a hub there, with the 762. AA will be starting daily flights to SJU with a 738 in December.
AA has extensive American Eagle ops to the northeast, and mainline service, in addition to all 4 hubs, to BOS, LGA, LGW, and will be starting service to SJU and SJC in the near future. AA did have a hub at RDU in the early 90s, but it went away in about 1995. Read more about the hub at http://airtransportbiz.free.fr/Networks/AABNARDU.html
And yes, Midway had one A320 briefly, I believe when their business model included ops to the Carribean. The routes to the Carribean and the plane didn't last long.