| Headquarters |
| CLE - Cleveland, OH - Cleveland Hopkins
International Airport |
|
| Mini Hubs |
| DTW - Detroit, MI - Detroit
Metro Wayne County International Airport |
| YYZ - Toronto, ON -
Toronto Pearson International Airport |
| CVG - Cincinnati, OH -
Cincinnati/Northern Kentucky International Airport |
ORD - Chicago, IL - Chicago O'Hare
International Airport
| MSP-
Minneapolis, Minnesota |
| GRB-Green
Bay Wisconsin |
| DBQ- |
|
|
| Connecting Cities |
|
| STL - St. Louis, MO - St. Louis Lambert
International Airport |
| PHL - Philadelphia, PA - Philadelphia
International Airport |
| JFK - New York, NY - John F. Kennedy
International Airport |
| BOS - Boston, MA - Boston Logan International
Airport |
|
| Full Service Cities |
| UIN - Quincy IL - Quincy Municipal-Baldwin
Airport |
| SPI - Springfield IL - Capital Airport |
| CMI - Champaign Urbana IL - University of
Illinois - Williard Airport |
| PIA - Peoria IL - Greater Peoria Regional
Airport |
| BMI - Normal Bloomington - Bloomington-Normal
Airport |
| IKK - Kankakee IL - Greater Kankakee Airport |
| ORD - Chicago IL - O'Hare International Airport |
| DEC - Decatur IL - Decatur Airport |
| RFD - Rockford IL - Greater Rockford Airport |
| HUF - Terra Haute IN - Hulman Regional Airport |
| EVV - Evansville IN - Evansville Regional
Airport |
| LAF - Lafayette IN - Purdue University Airport |
| SBN - South Bend IN - Michiana Regional Airport |
| FWA - Fort Wayne IN - Ft. Wayne International
Airport |
| MIE - Muncie IN - Delaware County-Johnson
Airport |
| GYY - Gary IN - Gary Regional Airport |
| IND - Indianapolis IN - Indianapolis
International Airport |
| SDF - Louisville KY - Standiford Airport |
| LEX - Lexington KY - Blue Grass Airport |
| BWG - Bowling Green KY - Warren County Regional
Airport |
| CIU - Sault Ste. Marie MI - Chippewa County
International Airport |
| TVC - Traverse City MI - Cherry Capital Airport |
| GRR - Grand Rapids MI - Kent County
International Airport |
| AZO - Kalamazoo MI - Kalamazoo/Battle Creek
International Airport |
| LAN - Lansing MI - Capital City Airport |
| JXN - Jackson MI - Jackson County/Reynolds
Field |
| BTL - Battle Creek MI - Kellogg Airport |
| ARB - Ann Arbor MI - Ann Arbor Municipal
Airport |
| DTW - Detroit MI - Detroit Metro Wayne County
Airport |
| FNT - Flint MI - Bishop International Airport |
| PHN - Port Huron MI - Port Huron - St.Clair
County International Airport |
| MBS - Saginaw MI - Tri-City International
Airport |
| 3B2 - Midland MI - Jack Barstow Airport |
| DLH - Duluth MN - Duluth International Airport |
| MSP - Minneapolis MN - Minneapolis/St. Paul
International Airport |
| RST - Rochester MN - Rochester Municipal
Airport |
| MKT - Mankato MN - Mankato Municipal Airport |
| ROC - Rochester NY - Greater Rochester
International Airport |
| IAG - Niagara Falls NY - Niagara Falls
International Airport |
| JHW - Jamestown NY - Chautauqua
County/Jamestown Airport |
| BUF - Buffalo NY - Greater Buffalo
International Airport |
| ITH - Ithaca NY - Tompkins County Airport |
| ELM - Elmira NY - Elmira/Corning Regional
Airport |
| SYR - Syracuse NY - Syracuse Hancock
International Airport |
| TOL - Toledo OH - Tolelo Express Airport |
| CLE - Cleveland OH - Hopkins International
Airport |
| YNG - Youngstown-Warren OH - Youngstown
Municipal Airport |
| CAK - Akron-Canton OH - Akron Canton Regional
Airport |
| CMH - Columbus OH - Port Columbus International
Airport |
| CVG - Cincinnati OH - Cincinnati/Northern
Kentucky International Airport |
| DAY - Dayton OH - Cox-Dayton International
Airport |
| ERI - Erie PA - Erie international Airport |
| PIT - Pittsburgh PA - Pittsburgh International
Airport |
| JST - Johnstown PA - Johnstown-Cambria Country
Airport |
| AOO - Altoona PA - Altoona-Blair County Airport |
| UNV - State College PA - State
College/University Park Airport |
| PHL - Philadelphia PA - Philadelphia
International Airport |
| HTS - Huntington WV - Tri-State/Ferguson
Airport |
| CRW - Charleston WV - Yeager Airport |
| MGW - Morgantown WV - Morgantown Muni-Walter L.
Bill Hart Field |
| EAU - Eau Claire WI - Chippewa Valley Regional
Airport |
| LSE - La Crosse WI - LaCrosse Municipal Airport |
| MSN - Madison WI - Dane County Regional / Truax |
| AUW - Wausau WI - Wausau Downtown Airport |
| OSH - Oshkosh WI - Wittman Regional Airport |
| GRB - Green Bay WI - Austin Straubel
International Airport |
| MKE - Milwaukee WI - General Mitchell
International Airport |
| CWA - Mosinee WI - Central Wisconsin Airport |
| YSB - Sudbury ON - Sudbury Municipal Airport |
| YYB - North Bay ON - Jack Garland Airport |
| YOO - Oshawa ON - Oshawa Municipal Airport |
| YYZ - Toronto ON - Toronto Pearson
International Airport |
| YHM - Hamilton ON - Hamilton International
Airport |
| YXU - London ON - London Airport |
| YZR - Sarnia ON - Sarnia Airport |
| YQG - Windsor ON - Windsor Airport |
| YQT - Thunder Bay ON - Thunder Bay
International Airport |
| YOW - Ottawa ON - Ottawa MacDonald/Cartier
International Airport |
| YAM - Sault Ste. Marie ON - Sault Ste. Marie
Federal Airport |
