WN avoids congested and high cost airports like the plague, take OAK and SFO as a great example. Going to DFW would amount to increased costs for very little return. If they reallyt wanted to off the Wright Ammendment, then Herb would be banging down every Congresspersons door trying to get it cancelled. As it stands, WN has an excellent operation at LUV and they don't want to mess with it.