TG has four of these, I think, all configured the same way. 2 flying BKK-LAX and 2 flying BKK-Scandinavia. Never known them to fly the 345 intra-Asia unless it was on a very temporary emergency basis. They have no other other aircraft capable of flying nonstop to LAX, so if you are actually going to be on the 345, it has to be one of the Scandinavian 345's. Due to heavy seasonal loads, esp in January, it would be likely that TG would put a bigger aircraft on the Scandinavian routes, allowing them to reallocate one or both 345's, even on a temporary basis. You sure it's not a 346 you've been assigned? Then again, TG plays a lot of aircraft roulette, so except for the nonstop to LAX, you never really know what you're going to end up with until you show up at the gate and see what's parked outside.