I took a flight (round trip) from Dallas to Joplin, you get a puddle jumper plane which surprisingly has better seating than the A321. The only problem is that there is not much headroom, specially standing up from your seat. 6 footers beware or you'll end up bumping your head. I did and I am not a 6 footer.
One issue to keep in mind is that the plane got delayed (is that usual?) and several of the passengers on-board had to rush to their connectin flights.
I had less than 40 minutes to go to another terminal for my next connecting flight, I rushed to get on-board but then the connecting flight got delayed to wait for other delayed passengers. It would have been nice for AA to let us know about it via text, app, etc. so we don't have to rush.