As far as the 757s go, if
AA does indeed put the old business seats into them it would have to be the ones out of the 777s. Those seats are of the correct width. The seats out of the 767 would fit more appropriately into the
MD-80, again judging only by width.
I thought the new business seats were supposed to be unveiled by now. I think there is supposed to be a 767 featuring them quite soon, with the refits beginning in earnest in September.
Hopefully someone has some info on this. I'm dying to know.