While I totally oppose this from happening, for a Japanese airline to be able to do it, even in a limited way, would actually be kind of fair since United and NW/Delta have been using NRT as a hub for quite a while and also do connections out of Nagoya and Osaka. I don't think they are allowed to do domestic flights within Japan, but they most definitely have their foot in the door over there in a way that pretty much all foreign carriers would love to do in America. I have no idea why Japan lets them do it, but I sure hope America never reciprocates.