Many Japanese traveller would not choose to land at PDX unless it's their destination.
The biggest reason is, rumor concerning PDX
immingration has been widely spread since
many DL passenger were denied entry at PDX.
From NRT, transit through MSP/DTW is much more convenient to most cities.

I doubt there are enough traveller to Oregon
from other Asian countries.

The route depends on how they fill the plane with US originating passenger.

[This message has been edited by orientflyer (edited Jan 08, 2004).]