I second christep.
My AONE3 itienary looks like
CAI-xLHR-HKG-NRT-HKG-NRT-HKG-NRT-HKG-YVR-...-CAI
with additional purchase of 2 segments.
I did another route like
CAI-xLHR-NRT-HKG-NRT-HKG-NRT-HKG-...-CAI
Additional 2 segments of Y/C/F = 300/800/1100 USD are
bargain for NRT-HKG roundtrips.