Yes, it would be only one flight -- Osaka to New York -- on China Airlines. That's it. Then I would be there at JFK to pick him up and bring him to Montreal. A day's jaunt for me!
I myself will be taking this complete trip by myself this July, so I'll check procedures while I'm on my way and get the skinny from the Japanese reps of China Airlines at Kansai airport so I'll know all about them (hopefully).
I really, really want his mother to bring him all the way to the gate -- not that I'm worried about it, but for her peace of mind. I'm sure they're a lot looser about those things in Japan than they are in the US although I could be wrong.
I'll blog the whole trip so you guys can fly to Japan with me!