Originally Posted by
Im a new user
I think that MEX-NRT-EWR is a very odd routing. I think that there is a risk that the airline will think that NRT is the intended destination and that the passenger is trying to abuse the system by showing up at NRT passport control and no-showing from the NRT-EWR leg. The airline might therefore deny boarding at MEX.
As far as NH (ANA) is concerned, it is only aware of the passenger's destination ending in NRT. Whether or not the ground staff at MEX would allow the separate ticket as validity for transit at the airline's own risk is the key.