Originally Posted by
gemini573
I would do DFW-HKG-BKK for sure. Your flight gets in around 18:05. Barring there isn't any delay, you could go on either the 20:00 flight, 21:50 flight, and 22:00 flight, depending on the day. On average, you have 3 options, and that's not including the days that RJ operates a HKG-BKK flight. Heck, you might even be able to do it on UL too.
Connecting in NRT, you have one chance. If you don't make it, you spend a night in Narita.
This 100%. Not only that, but the last thing I personally want to do after getting off a long flight is get on another long flight. Years ago, I did DFW-NRT-BKK in J, and even that was miserable. You'll be tired enough hopping off DFW-NRT, then the thought of another 6 hours in coach will drive you even crazier. I always prefer to do as much of the journey as I can during the first flight, then hop a short 1-2 hour connection over a 6-hour connecting flight.