Detroit's Airport has a number of pretty good food options, for an airport. I flew to and from Europe through DTW on a recent trip to Oslo, Norway, so I stopped for Japanese at a place called Sora, coming and going.
Double-pork Ramen. The pork slices are advertised as their awesome BBQ-pork, but it was kinda meh. The soup and noodles were great, though.
Gyoza Ramen. This totally made up for the meh of the pork ramen! Tasty, the pork sausage in the dumplings was very tasty. Combine that with a nice, cold beer, and it was a great post-long-flight dinner.