These are some freaking awesome pics and maps. Note that on the maps they show part of the Airport extending north of SH 114. Of course, that was never built. Also note that one of the maps shows "proposed 121A" in Grapevine running n/s W of International Pkwy.
The Airtrans photos really bring back memories. I got to ride it a lot as a kid and really liked it.
Link to the Photostream: http://www.flickr.com/photos/26775601@N04/with/11230617175 (http://www.flickr.com/photos/26775601@N04/with/11230617175)