Huskers, Welcome to Flyertalk and the Midwest Airlines Forum. When you get a chance, please update your profile with your home airport and programs you participate in.
To answer your question there are a handful of us, who post here regularly, that are members of Midwest Miles Executive. If you want an easy way to see if YX recognizes you as Executive or not, a small group of letters "
MME" prints on your boarding pass so you can use the elite lines in DCA, MKE, etc.
This thread might be of use to you:
http://www.flyertalk.com/forum/showthread.php?t=510197
Here's another:
http://www.flyertalk.com/forum/showthread.php?t=510197
Finally, if you want to talk to someone at YX try calling and ask to speak to Executive Services. 1-800-452-2022
The benefits of YX elite are small but welcome.