Wow, that's quite a chunk for a construction fee, LOL. Just looked it up, can't even avoid it for transits, and it's quite a lot more expensive for premium cabins. I think on a regular ticket you wouldn't necessarily notice it since CX tends to price their all-in price quite competitively, but on a xONEx with the first letter being A or D then it's more noticeable.

BTW, do you know of any online source for those codes to decode them? Google gets some of them but certainly not all.