Maybe they'll consider a domestic A380 if the program is very successful. I don't think (and mind you I'm not a technical expert) that an A340 domestic would serve much of a purpose as I believe the attractiveness of this plane is not so much capacity, but rather range. Also, there's not the kind of capacity difference between the A330 and A340 that there is between the 744 domestic and the 777-200. Therefore, since many airlines use the A330 on very short flights (I flew TG from BKK-Chiang Mai on an A330) and it works well, a dom. A340 wouldn't be particularly useful. But, that's mostly common sense talking rather than technical expertise.