So I have been told by Tex Tag, all toll roads in the Dallas area and all of Texas now accept Tex Tag. Including DFW Airport ( no more almost plowing through the plastic arms at the toll booth).
I've been using my TxTag in Austin, Houston, Dallas, and Tyler for several years now. Though, if it's true DFW Airport now accepts them, that's a welcome change. I've been thinking about switching to NTTA's "TollTag" as I believe they also work on Oklahoma Turnpikes.