O'hare
O'Hare is the closest, unless you're getting a screaming deal to fly into Midway, the extra cost of commute is not worth it. There are usually lots of shuttles going from O'Hare to the convention center and surrounding hotels.
O' Hare Airport. It is close to Rosemont and the Convention Center.
I don't know anything about this place. Stop sending me this stuff.
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