Thanks...hmmm, tricky one. We are actually flying from NRT to BKK, and I wanted to try out CX First (and avoid regional J). Using the CX451 seemed to be a good way to do it (as the NRT-TPE leg is reasonably long), but obviously there is the risk of having to overnight in HKG if the ex-NRT gets heavily delayed.
Maybe we should just stick with J and connect via HKG?