I've been to the BA lounge at DFW terminal D many times. My advice is "don't bother". It's likely the most unimpressive BA lounge in the system. They do have some (meager) food offerings but ten bucks at any airport restaurant will get you a better meal. In almost all cases you'll get a decent meal on the international flight anyway. There's just really not much reason to choose the BA lounge over the D Admirals Club prior to an international flight out of DFW. I have _not_ been in there when it's configured for Qantas but it's on my bucket list.