Originally Posted by hoieunkim
Thanks for the tip. So, if UAL apply the terms and conditions strictly or "correctly," they should allow my stop-over at GMP, because it's within the region of origin/destination of the itineray RSU-GMP-HND, right? Does any have a definite answer? It seems like every UAL agent has a different opinion.

No, you're explanation is wrong.
According to your idea, you can't have a stopover at anywhere.
However, you can have a stopover at GMP.
The reason why every UA agent gives a different answer is that some accept Japan as a part of North Asia, and some accept Japan as itself.
The correct answer is Japan is a single region.
It seems to be in North Asia, but actually not.
Thus, you can have a stopover at GMP.