I'm looking at upgrading my parents with miles from Y or PE to J on their flight to Asia. Their final destination can be reached with most of the codeshares with NH, SQ, BR, CX, etc, and anything out of SFO or LAX should work. I don't see any upgrade fare class available currently, so which routes generally have a good shot at getting off the upgrade waitlist? I've heard LAX-HKG has a good chance?