Originally Posted by
Thanh Viet
There are some free seat (a few) in J but only on one leg of my outbound or inbound trips (NCE-DXB or DXB-HKG) but never all the way to HKG or back to NCE ! So I can't upgrade as the rule doesn't authorize per flight upgrades

What do you mean the rules don't authorise per flight upgrade. Ofcourse you can upgrade all the way NCE-HKG or just NCE-DXB or DXB-HKG