Originally Posted by
Ldnn1
Could it be more effective instead to buy the Y cash ticket ICN-HKG-SGN and use miles to upgrade the HKG-SGN sector? Or even just pay to upgrade it. I don't know the CX rules on upgrades.
I haven't check this specific case yet, but upgradable Y fares on CX are generally very expensive and upgrade with miles is normally a bad idea from Y to J regionally.