What's your point? Once you're in downtown Chicago you can hop on a train or bus that runs every 5 minutes and get anywhere in the city at almost any time. I once took the bus from the airport to my place around 45th and Airport Blvd. and it took about 90 minutes to go 7.5 miles on a route that made very little logical sense. The next available bus from my current location not even 6 miles from the airport and along a major corridor leaves at 5AM, requires a transfer and still takes over 60 minutes. Even from downtown Austin, as of 11:45PM, you can't get to the airport via bus until 6AM at the earliest. But hey, who needs improved public transit?