Originally Posted by
porphyra
I am assuming this is post the Japan restrictions lifting. As of now, you are not allowed to stay in Japan overnight, you must transit the same day without "entering" Japan, even once JL publishes a more robust China schedule.
Do you have a link for that? I have seen nothing that would prevent you from staying airside overnight in Haneda. Narita is a problem, as the terminal closes overnight, and an overnight connection would not be allowed. But for Haneda we are discussing here, I have not seen, read, or heard anything that would indicate that an overnight transit will not be allowed.