redtigeriii

I found it on ITA and double checked on Orbitz. There are more dates but if you put 8/31 and 9/9 into Orbitz and search for a round trip SFO-CKG, you'll find it. It's a seperate deal on Air China than the SFO-HKG. Also the base fares are super low whereas the other deal its an issue with the YQ so yeah its a completely different thing, just weird coincidence I guess.

Also you can get sub $600 r/t on Air China to some other cities in China (WUH, FOC to name two)