Thanks for the suggestions on eating at Narita, but, as I said above, they will not be stopping in Japan - their flights to/from China are non-stop to/from Detroit.
The DTW-Beijing service has been going since 5/1/96 and the Shanghai service is more recent. See news story at NorthWest's website:
http://www.nwa.com/corpinfo/newsc/20...120010657.html