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Indianapolis (Indianapolis International Airport)
(Indiana) (United States) -
Des Moines (Des Moines International Airport)
(Iowa) (United States) -
Louisville (Louisville International Airport)
(Kentucky) (United States) -
Flint (Bishop International Airport)
(Michigan) (United States) -
Grand Rapids (Gerald R. Ford International Airport)
(Michigan) (United States) -
Minneapolis/Saint Paul (Minneapolis-Saint Paul International Airport)
(Minnesota) (United States) -
Kansas City (Kansas City International Airport) Secondary Hub
(Missouri) (United States) -
St. Louis (Lambert-St. Louis International Airport)
(Missouri) (United States) -
Omaha (Eppley Airfield) (focus city)
(Nebraska) (United States) -
Cleveland (Cleveland Hopkins International Airport)
(Ohio) (United States) -
Columbus (Port Columbus International Airport)
(Ohio) (United States) -
Dayton (James M. Cox Dayton International Airport)
(Ohio) (United States) -
Pittsburgh (Pittsburgh International Airport)
(Pennsylvania) (United States) -
Nashville (Nashville International Airport)
(Tennessee) (United States) -
Appleton (Outagamie County Regional Airport)
(Wisconsin) (United States) -
Green Bay (Austin Straubel International Airport)
(Wisconsin) (United States) -
Madison (Dane County Regional Airport)
(Wisconsin) (United States) -
Milwaukee (General Mitchell International Airport) (Hub)
(Wisconsin) (United States)
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