Great question — answering as the UphillTech team:
If you are planning to use the BA or Qantas lounges, I would suggest you bring a copy of the OneWorld lounge access rules with you. The BA lounge at least has contract staff doing the sign-in, and they tend not to be that familiar with the more unusual cases. The BAEC FlyerTalk lounge details sticky has a good comparison of the BA and AA lounges (scroll down to DFW). The BA lounge is a lot smaller, but it has free food, free drinks and champagne on request. The AA D lounge has a very small range of free drinks (though BAEC guests get drinks vouchers for more, but I think AA ones don't), and no free food. The AA lounge in D is much larger, has better views over the airport, and is open...
Full answer by Gagravarr: https://travel.stackexchange.com/a/20624 (CC BY-SA 3.0).
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