Chicago

====Airports====
{{Further|Transportation in Chicago#Airports}}
[[File:Chicago O'Hare International Airport.jpg|thumb|[[O'Hare International Airport]]]]
Chicago is served by [[O'Hare International Airport]], the world's busiest airport measured by airline operations,<ref>{{cite web |url=http://www.aci.aero/News/Releases/Most-Recent/2016/04/04/ACI-releases-preliminary-world-airport-traffic-rankings- |title=Annual Traffic Data – 2015 Preliminary |work=[[Airports Council International]] |access-date=May 6, 2015 |archive-date=April 5, 2016 |archive-url=https://web.archive.org/web/20160405082544/http://www.aci.aero/News/Releases/Most-Recent/2016/04/04/ACI-releases-preliminary-world-airport-traffic-rankings- |url-status=live }}</ref> on the far Northwest Side, and [[Midway International Airport]] on the Southwest Side. In 2005, O'Hare was the world's busiest airport by aircraft movements and the second-busiest by total passenger traffic.<ref>{{cite web |url=http://www.airports.org/aci/aci/file/Press%20Releases/PR140306_2005_Prelim_Results.pdf |title=Preliminary Traffic Results for 2005 Show Firm Rebound (March 14, 2006) |url-status=dead |archive-url=https://web.archive.org/web/20060623093321/http://www.airports.org/aci/aci/file/Press%20Releases/PR140306_2005_Prelim_Results.pdf |archive-date=June 23, 2006}}&nbsp;{{small|(520&nbsp;KB)}}. ''Airports Council International''.</ref> Both O'Hare and Midway are owned and operated by the City of Chicago. [[Gary/Chicago International Airport]] and [[Chicago Rockford International Airport]], located in [[Gary, Indiana]] and [[Rockford, Illinois]], respectively, can serve as alternative Chicago area airports, however they do not offer as many commercial flights as O'Hare and Midway. In recent years the state of Illinois has been leaning towards [[Proposed Chicago south suburban airport|building an entirely new airport]] in the Illinois suburbs of Chicago.<ref>{{cite news |last=Metsch |first=Steve |title=Top IDOT official says third airport will be built |url=http://www.suntimes.com/news/14080173-418/top-idot-official-says-third-airport-will-be-built.html |archive-url=https://web.archive.org/web/20120801232449/http://www.suntimes.com/news/14080173-418/top-idot-official-says-third-airport-will-be-built.html |url-status=dead |archive-date=August 1, 2012 |access-date=June 11, 2013 |newspaper=Chicago Sun-Times}}</ref> The City of Chicago is the world headquarters for [[United Airlines]], the world's third-largest airline.