This is one of the things I dislike about AA. Every year I go to PHX 2-3 times out of ORD, and it was nice when they had the 757's. Then they dropped those completely and just had the md-80's. Now those aren't too bad for a 3 hour flight, but when there is a delay for any reason and all of a sudden it becomes a 4 hour flight, it would be nice to have that entertainment.
As for RJ's, I hate taking them on trips over 1-1.5 hours.