The 146's are indeed flown by Air-Wisconsin, based in Appleton, Wisconsin. The fly from Chicago, but also into Denver. They have one flight that leaves Appleton in the morning to Milwaukee, then onto Denver. It then flies to Santa Barbara, CA. I always though that was a interesting that Appleton, Wisconsin had a direct west coast flight!
I believe Air Wisconsin has 18 -146's. They are grand-fathered in, but no more -146's can be added due to contract with main-line United Pilots.
Hope this helps. They are wonderful planes as I flew them all the time when I lived in Appleton for 16 months.