I never realized this, but the code CXUBCAL gives you 5% off routes YYZ/YVR-PEK/Shanghai/HKG with Cathay.

It's from the partnership with CX and UBC but the code is available for everyone to use. Not much, but a little? Works for Y/PE/J (it's 5% off for Y, I didnt bother checkig PE/J)