AA sells one-year/six-month valid tickets to N. America ex. some Asian cities including HKG, right now all via either NRT or KIX. Intra-Asia flights to and from NRT/KIX can be arranged on CX (if you prefer) as well as any other airliens that fly the route you would like, including UA and NW. They are pretty cheap, compared with UA or NW's tickets to North America.

I think ex-HKG it could be six months. But if you return frequently to HKG, just switch to this ticket, and you can fly CX for flights to NRT or KIX. Return flighs are date-changeable but not reroutable, though.

The only problem with CX may be the subclass they use. I think it is N or M, I forgot which.