Part 2 of the DFW that never was built has been posted, along with a whole series on JFK. It's a very content-rich site.
https://www.airporthistory.org/dfw-rebuild-2.html
looks like someone had plans for the TRAAM to be under the apron,along with a massive boxy-looking building that made me instantly think of T4 @ PHX when I saw the rendering. It's a LOT of cement.
And because I don't feel like starting a thread for JFK and it's not just for AA, I'll just put their link here for JFK in case people want to find that part of the site:
https://www.airporthistory.org/kennedy.html
Enjoy