As long as the airplane is in international flight it is governed mostly by the rules of the country it's registered to, not the rules of the country its flying

As long as the airplane is in international flight it is governed mostly by the rules of the country it's registered to, not the rules of the country its flying over. So I suspect you could use this on an international flight flying over China or any other country that is party to the Tokyo convention. The Tokyo convention does have a lot of exceptions like national security but its not obvious they apply here. https://en.wikipedia.org/wiki/Tokyo_Convention https://en.wikipedia.org/wiki/Tokyo_Convention