Does NWA fly from Portland to NRT? I never heard of it. If they did, I don't see why not, same ZED fare probably, most likely. Why don't you call the NWA toll free number 800-225-2525. That's the number you are supposed to call to list yourself. Ask them. I used NWA many times going to NRT but not in the last 5 years. Two years ago I couldn't get out to NRT from MNL. First time I ever ran into load problems with NWA out of MNL. I ended up taking Continental via the milk run. MNL-GUM barely HNL-and barely IAH. But we made it. Got the last two seat next to the crappers out of HNL. Didn't cost me a dime. Took a couple of months to get my NWA tickets refunded though.