I was always curious to know why DTW's busiest international route is to Amsterdam. Is there a specific reason for this? Does SE Michigan have special business ties or some sort of special relationship with the Dutch that contributes to this? As a matter of fact, well over 600K passengers fly annually from DTW to Schiphol. The 2nd highest from DTW is the Frankfurt route with about 245K.

Any thoughts on this?

Rijksmuseum - atcha