There seems to be a new development on the AA site. Under specials there is now a last minute Get-A-way.
I found a trip IAH-LGW for $388. Nothing shows from Dallas. So you have to work with it a little bit.
Go Look. You may find a deal. It will take some work, but they are there.
Frank

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TANSTASFL - but if you work it right, FF miles comes pretty close.