I am planning a "quick" trip to the Namibian coast & best routing for Zed fares available to me would include ATL/JNB on Delta, or NYC/FRA/JNB on Lufthansa. First choice is, of course, the nonstop, but if there is danger of being stranded without a seat, I'd rather be in Frankfurt than Atlanta. Any comments on space availability at different times of year would be much appreciated.