Agreed on the density it does have something to do with it. I think travel points have a lot to do with it as well. I don't know about the Ohio airports but I know DTW has direct flights to China. There is actually not that many airports that have that(it looks like 9 and most of them are hotspots). There is a lot of traffic through China through DTW, I think with Ohio V Michigan DeWine went in much earlier and really Michigan should have went in earlier than Ohio. There is also a lot of traffic through DTW to Italy because of FCA. London was going to bear a big brunt because Heathrow is a gigantic airport.
Something else to consider is that downtown Detroit has three casinos (Greektown, Motor City and MGM Grand). Lots of people get off the plane, and head to the casino hotels, where loads of local Detroit area folks also go. Especially seniors. That could be a partial explanation for the rapid spread in the Detroit area.
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