First point to be made is that on the Eagle commuter jets, there was a noticeable measure of extra room, as compared with the extra-cramped Delta commuter jets. Not that these jets are comfortable for a man my size. But at least I wasn't forced to meditate to keep a claustrophobic panic attack from happening, as did happen with me with Delta back in January. And most interesting to me was that on this tiny commuter jet, the windows were set high enough in the wall and were large enough that an adult could readily see out. A nice little extra that I enjoyed.
Second point here is that our plane developed a sensor malfunction while we were taxiing, and forced us to go back to the terminal. We ended up being a couple of hours late getting to our connection at JFK. But that wasn't a real problem, as our layover was scheduled to be nearly 3 hours... and JFK traffic is significantly slowed these days because of a major runway being out of service for repairs.
On the transatlantic flight, the 767 we rode in was decent. Again, slightly more room available than a similar Delta jet, which I appreciated. The meals they served were eatable (not QUITE the disgusting lumps I've seen on some long-haul flights), and the drink selection was pretty good. I thought it was nice that they placed plastic-bagged flight survival kits in the seats, with a blanket, pillow and headphone set. Oddly enough, the blankets were not needed. The cabin was overly warm all the way across the ocean, and several folks mentioned that they were sweating at least part of the way. Somewhat surprising, based on my limited exposure to long flights.
On all the flights we took, the flight crew was extremely nice and helpful. Again, my exposure to flight crew interaction is minimal, but they seemed better at their job than many that I've seen at Delta or USeless Air.
Our experience flying from Heathrow back to RDU was more or less a mirror of the trip east-bound, except that we ran across no mechanical difficulties.
Overall, I'd give AA a B or B+ -- I personally thought they are better to fly with than most airlines I've encountered. I may use them again in the future, if they have a good itinerary for my needs.