I think what's happening right now is that the ex Reno aircrafts are being retired or sold to some other companies like you say, and they are being replaced on the West Coast with standard AA MD-80's. American is now operating it's own MD-80's out of its two hubs on the West Coast, LAX and SJC. Since a number of Super 80's are being transfered to the West Coast hubs, you will see more 757's and 737-800's on the rest of the domestic network where there used to be a lot of MD-80's. For example, DFW-LGA and ORD-LGA are no longer "all MD-80". DFW-LGA has a few 757's and ORD-LGA has a few 737-800's, those are just two examples among many that we can think of. DFW-ORD is still "all MD-80" with the exeption of one 777. The MD-80 is out of production, but the 757 and NG737's are not.