I know that some partners like BA will allow this, but as far as I can tell, it's impossible to book such an itinerary with JAL miles... is that correct? Trying to figure out the best way to book DCA-ORD-NRT with the transpac in PY.

(While I'm at it, does anyone know why JAL has four different oneworld award charts for members in different regions... and the prices on each seem to be exactly the same???)