Originally Posted by
Cathay Boy
Unfortunately the reality isn't what the document said. The agent claimed since Air China and CX doesn't have a "luggage agreement", she refused to tag my bags to my ongoing KA flight. What's worst, because there's no agreement, therefore my bags are considered overweight by domestic flight standards, and I had to pay 136 CNY out of pocket.
Never flying Air China intra-China again, sticking with China Eastern from now on.
According to website, Air China is partner airline. Of course they will have
luggage agreement

I guess the agent don't know what he/she was talking about...
Or else, why I can do it? on reverse way though....
https://www.asiamiles.com/am/en/earn/airlines