Use BA (OW Sapphire) or CX (lowly Green)?
I'm flying HKG - SFO (CX872) and back (CX873) in J. There seems to be a few empty seats in J.
Should I record my booking with my BAEC (OW Sapphire) for better chances of an upgrade?
What is the typical Y load factor? Hoping there could be Y pax bumped up to J and CX would in turn bump J pax for F. If this isn't a likelihood then I'd prefer to load up on Asiamiles than Avios.