I did a search and found this thread that might be of some help for you
Photography At DTW (by D L X Dec 1 2005 in Aviation Photography)
While I'm at it..where do you do a majority of your spotting? I take it you're located in Michigan..i'm at purdue and MI
isnt that far a drive from here and am looking for some good places to go..have you tried out GRR
? seems like good spots but not great flow of traffic. DTW
is about 6-7 hrs for me..well hope u get some good stuff if you make it out there.