Friends of mine are flying MSP-DTW-NRT-ICN on NWA of course and back ICN-NRT-SFO-MSP I know on the way back they are going to have to get their luggage @ SFO and go thru customs, but my ? in on the NRT-ICN stops do they have to get the luggage in NRT and do the customs thing there (they are not leaving the airport) or can it be checked all the way thru to ICN?

Thanks

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Sorry mama I gots to get all the free miles I can.

Brian