17
Your mother's green card allows her to be in the US, and to enter the US, but it has no relevance to Japan. Thus, with an expired Chinese passport and a US green card, she will be denied boarding for the Guam > Japan flight.
13
While the concept is interesting, it is unlikely except perhaps in very limited cases.
The issue is that it is difficult to prevent you from leaving an airport. So, when boarding, you would have to meet the requirements of the destination country of your ticket. Simply telling the agent that you don't intend to leave will not make them waive pre-boarding ...
11
She does not have a passport, so it's possible that she will not be able to board the flight to Japan.
A "domestic" flight from Guam to Mainland USA might be possible, but what you're describing is technically an "international" flight to Japan followed by another international flight to USA. If nothing goes wrong, you probably won't have ...
9
So I wonder whether it would be possible to travel from transit zone to transit zone,
No.
When boarding a flight from A to B, the airline MUST check whether you meet immigration and Covid requirements for your destination country and will decline boarding if you can't show these.
If you have a "good" passport you may be able to get away with the ...
4
This is not practical because many airlines will check if you have the right to enter your destination country. In theory you could book the entire trip before leaving, and claim that your destination country is the same as your home country, but your question was about booking onward travel when already partway through the journey.
4
Go there a day earlier and check it out in person. There is a 90% that it will be in the same place the next day.
This depends a lot on the airline and the airport but unless the airline has a major presence in the airport, it's allocated dynamically. As long as the flight schedules don't change much, the allocation doesn't change that often but it DOES ...
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