AA does not plan to replace the MD
-80s for a while. In fact, they are homogenising the fleet in terms of equipment and fixing up the interiors. I see them flying at least another decade.
When they will be replaced, my guess would be that AA
will purchase either the 737NG or whatever comes after that, or the A32x or whatever comes after that, or some Embraer equivalent if there is one by then. Yes I know this is covering all the bases
For those who think that AA
"will never buy Airbus and blablabla", 10+ years is a long time and money talks.