Re: Tower or TRACON Tour?
Chicago Approach (C90 Tracon; Elgin) handles all IFR traffic in an out of ORD and it's satellite airports, from the surface to 13,000 feet and out to a 40 mile radius of ORD. It is the control operation for the class B airspace surrounding ORD.
Chicago Center (ZAU ARTCC; Aurora) handles all IFR traffic during enroute phases of flight, and feeds traffic into terminal areas.
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