Originally Posted by
alan11
If taking a domestic flight in Japan that is not part of the international ticket and booked separately, then you would need to re-check the baggage at HND after arrival.
It may be possible to connect the baggage through at Itami if flying out to MSP on the same airline (or partner airline), but I've never done this so you should check with the airline(s). Usually when ticketed separately it isn't possible, but I'd be pretty sure someone here should know. (but if going to MSP direct that's probably Delta, which has no partnership with either JAL or ANA)
Also, there is transfer at HND from the Domestic Terminal to the Int'l Terminal via shuttle bus (takes 5-10 minutes) and if needing to re-check your baggage you may need to carry your baggage on the shuttle bus with you.
JAL and ANA will check through to international flights on separate tickets, even to non partners. Last I checked in at the counter for international connections at Fukuoka with JAL, the lady next to me was checking through to Delta no problem.