CX889 is the JFK-YVR-HKG routing.
Serfy, I seem to recall something on the CX forum that talked about seasonal equipment changes on this routing. I am sure it is just a case of AA being a bit slow on the uptake, so to speak.
ahh - found it. Here we go:
http://www.flyertalk.com/forum/showthread.php?t=514016