Wow, that's an interesting question:
Let's say a Canadian flies from New York to Tokyo on Korean Air and hacks the German tourist's computer seated in front of her while over the Pacific. Who's laws apply? (Canada, US, Japan, Korea, Germany?)
I mean, we have a hard time answering this question if everybody is grounded but what about such a scenario?
This is an attempt to explain: Hacking on the plane: who has jurisdiction?