If you're willing to do some funky routing and leave from Love Field, you can do it for a lot less through SeaPort Airlines (http://www.seaportair.com) (which I'd never heard of before!)
You can drive Dallas-Memphis in 7 hrs or less. If you want to break the trip, like leave after work in Dallas, there used to be a really good restaurant in Texarkana (Park Place).
Best of luck with it. I found a "could you pass a US citizenship interview?" questionnaire on the Christian Science Monitor website recently and got 95%, leaving me thinking "the real one can't be this easy."
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