No. Not yet. But would love to go.
The second you have the opportunity to go, take it. It is such a magnificent, clean city! So much to do, so much to see. If you want some aviation while on in Chicago, I recommend going during the Annual Air and Water Show. From the lakeshore, there are some fantastic views. Unfortunately, while there isn't anything happening, it can get a little boring. But it is great fun...and usually features the Blue Angels.