Here is another link to a local discussion.
Post #21 explains what I've encountered flying out of Detroit metro.
http://thefiringline.com/forums/showthread.php?t=402178
There's really not much to it other than giving yourself additional time for the inspection and securing your weapons in your luggage with the TSA agent
Flying with a gun in and out of NY or NJ is much more complicated, and can easily land a person in jail and have their gun confiscated if not extremely careful.