CX 870 HKG-SFO also canceled on Nov 15th.
CX 879 SFO-HKG canceled on Nov 29th, meaning CX 870 also canceled on Nov 29th ex: HKG.
Something to do with Thursday's it seems.
I have been traveling on this route for years. It's not daylight savings time related - I'm sure of that.
Maybe some sort of rotation with refurbishment or maintenance checks ?