Only the airport! (well, except last week when our flight from Minneapolis to Narita was delayed so Delta Airlines out us up in a Radisson in Narita for the night...that was my longest time in Japan)
I go from Taiwan to Canada and if I fly from Hong Kong to Vancouver the plane is packed...but when I go to Japan first to transfer I've never had anyone sitting next to me.
Also..on the way to Canada last month there were no personal TVs in the seats, and the movies were crap on the big communal screen (Mr. Popper's Penguins, Zookeeper and a Kate Hudson movie then a Reese Witherspoon) and that sucks for an 11 hour flight.
On the way back I had my own TV and watched the original Planet of the Apes, Green Lantern, 3 episodes of Big Bang Theory, All-Star Superman, a Simpsons, A Futurama and a Louis CK show. Wow...that was a lot of TV. That shows you how long these flights are.