In case it helps anyone, the way I found this flight quickly was using
flightconnections.com, putting in DTW and then zooming in on NYC to see which nearby airports have direct flights to DTW.
I've used that site in the past to find alternate plans or just to see where all the direct flights out of any airport are (dw hates taking connecting flights with kids, so vacations are pretty much limited to destinations with direct flights).
I'm sure there are other sites that do the same- feel free to suggest one if you have one that you like.