I flew the TG BKK-LAX route a couple of times on the A340-500, enjoyed it. My recollection is that the fuel costs were the problem. Are the fuel costs for the same number of people reduced for the same route with the A350 based on the magic of modern technology and number of engines? If so, I can imagine a non-stop out of Singapore or another hub making a lot more sense to people who just want to get it over with in one go.