| Antrim County (ACB) | Bellaire | MI | Fond Du Lac County to Antrim County |
| Lenawee County (ADG) | Adrian | MI | Fond Du Lac County to Lenawee County |
| Albert Lea Municipal (AEL) | Albert Lea | MN | Fond Du Lac County to Albert Lea Municipal |
| Amery Municipal (AHH) | Amery | WI | Fond Du Lac County to Amery Municipal |
| Anderson Municipal-Darlington Field (AID) | Anderson | IN | Fond Du Lac County to Anderson Municipal-Darlington Field |
| Atlantic Municipal (AIO) | Atlantic | IA | Fond Du Lac County to Atlantic Municipal |
| Akron Fulton International (AKC) | Akron | OH | Fond Du Lac County to Akron Fulton International |
| St Louis Regional (ALN) | Alton | IL | Fond Du Lac County to St Louis Regional |
| Waterloo Regional (ALO) | Waterloo | IA | Fond Du Lac County to Waterloo Regional |
| Gratiot Community (AMN) | Alma | MI | Fond Du Lac County to Gratiot Community |
| Ames Municipal (AMW) | Ames | IA | Fond Du Lac County to Ames Municipal |
| Tri-State Steuben County (ANQ) | Angola | IN | Fond Du Lac County to Tri-State Steuben County |
| Lima Allen County (AOH) | Lima | OH | Fond Du Lac County to Lima Allen County |
| Alpena County Regional (APN) | Alpena | MI | Fond Du Lac County to Alpena County Regional |
| Ann Arbor Municipal (ARB) | Ann Arbor | MI | Fond Du Lac County to Ann Arbor Municipal |
| Lakeland/Noble F. Lee Memorial Field (ARV) | Minocqua | WI | Fond Du Lac County to Lakeland/Noble F. Lee Memorial Field |
| John F Kennedy Memorial (ASX) | Ashland | WI | Fond Du Lac County to John F Kennedy Memorial |
| Austin Municipal (AUM) | Austin | MN | Fond Du Lac County to Austin Municipal |
| Wausau Downtown (AUW) | Wausau | WI | Fond Du Lac County to Wausau Downtown |
| Chicago/Aurora Municipal (AUZ) | Chicago | IL | Fond Du Lac County to Chicago/Aurora Municipal |
| Algona Municipal (AXG) | Algona | IA | Fond Du Lac County to Algona Municipal |
| Chandler Field (AXN) | Alexandria | MN | Fond Du Lac County to Chandler Field |
| Auglaize County Neil Armstrong (AXV) | Wapakoneta | OH | Fond Du Lac County to Auglaize County Neil Armstrong |
| Kalamazoo/Battle Creek International (AZO) | Kalamazoo | MI | Fond Du Lac County to Kalamazoo/Battle Creek International |
| Benson Municipal (BBB) | Benson | MN | Fond Du Lac County to Benson Municipal |
| Southwest Michigan Regional (BEH) | Benton Harbor | MI | Fond Du Lac County to Southwest Michigan Regional |
| Virgil I Grissom Municipal (BFR) | Bedford | IN | Fond Du Lac County to Virgil I Grissom Municipal |
| Bemidji Regional (BJI) | Bemidji | MN | Fond Du Lac County to Bemidji Regional |
| Wayne County (BJJ) | Wooster | OH | Fond Du Lac County to Wayne County |
| Burke Lakefront (BKL) | Cleveland | OH | Fond Du Lac County to Burke Lakefront |
| MidAmerica St Louis Scott AFB (BLV) | Belleville | IL | Fond Du Lac County to MidAmerica St Louis Scott AFB |
| Monroe County (BMG) | Bloomington | IN | Fond Du Lac County to Monroe County |
| Central Illinois Regional at Bloomington Normal (BMI) | Bloomington | IL | Fond Du Lac County to Central Illinois Regional at Bloomington Normal |
| Boone Municipal (BNW) | Boone | IA | Fond Du Lac County to Boone Municipal |
| Brainerd Lakes Regional (BRD) | Brainerd | MN | Fond Du Lac County to Brainerd Lakes Regional |
| Southeast Iowa Regional (BRL) | Burlington | IA | Fond Du Lac County to Southeast Iowa Regional |
| Battle Creek Executive (BTL) | Battle Creek | MI | Fond Du Lac County to Battle Creek Executive |
| Wexford County (CAD) | Cadillac | MI | Fond Du Lac County to Wexford County |
| Northeast Iowa Regional (CCY) | Charles City | IA | Fond Du Lac County to Northeast Iowa Regional |
| Mettel Field (CEV) | Connersville | IN | Fond Du Lac County to Mettel Field |
| Cuyahoga County (CGF) | Cleveland | OH | Fond Du Lac County to Cuyahoga County |
| The Eastern Iowa (CID) | Cedar Rapids | IA | Fond Du Lac County to The Eastern Iowa |
| Arthur N Neu (CIN) | Carroll | IA | Fond Du Lac County to Arthur N Neu |
| Chippewa County International (CIU) | Sault Ste Marie | MI | Fond Du Lac County to Chippewa County International |
| Cleveland/Hopkins International (CLE) | Cleveland | OH | Fond Du Lac County to Cleveland/Hopkins International |
| Clintonville Municipal (CLI) | Clintonville | WI | Fond Du Lac County to Clintonville Municipal |
| Columbus Municipal (CLU) | Columbus | IN | Fond Du Lac County to Columbus Municipal |
| John Glenn International (CMH) | Columbus | OH | Fond Du Lac County to John Glenn International |
| University of Illinois-Willard (CMI) | Champaign/Urbana | IL | Fond Du Lac County to University of Illinois-Willard |
| Houghton County Memorial (CMX) | Hancock | MI | Fond Du Lac County to Houghton County Memorial |
| Sparta/Fort Mccoy (CMY) | Sparta | WI | Fond Du Lac County to Sparta/Fort Mccoy |
| Columbia Regional (COU) | Columbia | MO | Fond Du Lac County to Columbia Regional |
| St Louis Downtown (CPS) | Cahokia/St Louis | IL | Fond Du Lac County to St Louis Downtown |
| Creston Municipal (CSQ) | Creston | IA | Fond Du Lac County to Creston Municipal |
| Cincinnati Northern Kentucky International (CVG) | Cincinnati | OH | Fond Du Lac County to Cincinnati Northern Kentucky International |
| Central Wisconsin (CWA) | Mosinee | WI | Fond Du Lac County to Central Wisconsin |
| Clinton Municipal (CWI) | Clinton | IA | Fond Du Lac County to Clinton Municipal |
| Dayton International James M Cox (DAY) | Dayton | OH | Fond Du Lac County to Dayton International James M Cox |
| Dubuque Regional (DBQ) | Dubuque | IA | Fond Du Lac County to Dubuque Regional |
| Decatur (DEC) | Decatur | IL | Fond Du Lac County to Decatur |
| Decorah Municipal (DEH) | Decorah | IA | Fond Du Lac County to Decorah Municipal |
| Coleman A Young Municipal (DET) | Detroit | MI | Fond Du Lac County to Coleman A Young Municipal |
| Defiance Memorial (DFI) | Defiance | OH | Fond Du Lac County to Defiance Memorial |
| Duluth International (DLH) | Duluth | MN | Fond Du Lac County to Duluth International |
| Denison Municipal (DNS) | Denison | IA | Fond Du Lac County to Denison Municipal |
| Vermilion Regional (DNV) | Danville | IL | Fond Du Lac County to Vermilion Regional |
| Dupage (DPA) | Chicago | IL | Fond Du Lac County to Dupage |
| Drummond Island (DRE) | Drummond Island | MI | Fond Du Lac County to Drummond Island |
| Des Moines International (DSM) | Des Moines | IA | Fond Du Lac County to Des Moines International |
| Detroit Metro Wayne County (DTW) | Detroit | MI | Fond Du Lac County to Detroit Metro Wayne County |
| Davenport Municipal (DVN) | Davenport | IA | Fond Du Lac County to Davenport Municipal |
| Chippewa Valley Regional (EAU) | Eau Claire | WI | Fond Du Lac County to Chippewa Valley Regional |
| Webster City Municipal (EBS) | Webster City | IA | Fond Du Lac County to Webster City Municipal |
| Iosco County (ECA) | East Tawas | MI | Fond Du Lac County to Iosco County |
| Jefferson Municipal (EFW) | Jefferson | IA | Fond Du Lac County to Jefferson Municipal |
| Eagle River Union (EGV) | Eagle River | WI | Fond Du Lac County to Eagle River Union |
| Elkhart Municipal (EKI) | Elkhart | IN | Fond Du Lac County to Elkhart Municipal |
| Centralia Municipal (ENL) | Centralia | IL | Fond Du Lac County to Centralia Municipal |
| Kenosha Regional (ENW) | Kenosha | WI | Fond Du Lac County to Kenosha Regional |
| Keokuk Municipal (EOK) | Keokuk | IA | Fond Du Lac County to Keokuk Municipal |
| Delta County (ESC) | Escanaba | MI | Fond Du Lac County to Delta County |
| Estherville Municipal (EST) | Estherville | IA | Fond Du Lac County to Estherville Municipal |
| Eveleth-Virginia Municipal (EVM) | Eveleth | MN | Fond Du Lac County to Eveleth-Virginia Municipal |
| Evansville Regional (EVV) | Evansville | IN | Fond Du Lac County to Evansville Regional |
| Faribault Municipal (FBL) | Faribault | MN | Fond Du Lac County to Faribault Municipal |
| Flying Cloud (FCM) | Minneapolis | MN | Fond Du Lac County to Flying Cloud |
| Findlay (FDY) | Findlay | OH | Fond Du Lac County to Findlay |
| Albertus (FEP) | Freeport | IL | Fond Du Lac County to Albertus |
| Fairfield Municipal (FFL) | Fairfield | IA | Fond Du Lac County to Fairfield Municipal |
| Fort Madison Municipal (FMS) | Fort Madison | IA | Fond Du Lac County to Fort Madison Municipal |
| Bishop International (FNT) | Flint | MI | Fond Du Lac County to Bishop International |
| Fort Dodge Regional (FOD) | Fort Dodge | IA | Fond Du Lac County to Fort Dodge Regional |
| French Lick Municipal (FRH) | French Lick | IN | Fond Du Lac County to French Lick Municipal |
| Fairmont Municipal (FRM) | Fairmont | MN | Fond Du Lac County to Fairmont Municipal |
| Fort Wayne International (FWA) | Fort Wayne | IN | Fond Du Lac County to Fort Wayne International |
| Forest City Municipal (FXY) | Forest City | IA | Fond Du Lac County to Forest City Municipal |
| Galesburg Municipal (GBG) | Galesburg | IL | Fond Du Lac County to Galesburg Municipal |
| Gladwin Zettel Memorial (GDW) | Gladwin | MI | Fond Du Lac County to Gladwin Zettel Memorial |
| Gaylord Regional (GLR) | Gaylord | MI | Fond Du Lac County to Gaylord Regional |
| Grand Rapids/Itasca County-Gordon Newstrom Field (GPZ) | Grand Rapids | MN | Fond Du Lac County to Grand Rapids/Itasca County-Gordon Newstrom Field |
| Galion Municipal (GQQ) | Galion | OH | Fond Du Lac County to Galion Municipal |
| Austin Straubel International (GRB) | Green Bay | WI | Fond Du Lac County to Austin Straubel International |
| Greenville (GRE) | Greenville | IL | Fond Du Lac County to Greenville |
| Grand Marais/Cook County (GRM) | Grand Marais | MN | Fond Du Lac County to Grand Marais/Cook County |
| Gerald R Ford International (GRR) | Grand Rapids | MI | Fond Du Lac County to Gerald R Ford International |
| Goshen Municipal (GSH) | Goshen | IN | Fond Du Lac County to Goshen Municipal |
| Grantsburg Muni (GTG) | Grantsburg | WI | Fond Du Lac County to Grantsburg Muni |
| Grissom Aeroplex/Arb (GUS) | Peru | IN | Fond Du Lac County to Grissom Aeroplex/Arb |
| Gary/Chicago International (GYY) | GARY | IN | Fond Du Lac County to Gary/Chicago International |
| Three Rivers Municipal Dr Haines (HAI) | Three Rivers | MI | Fond Du Lac County to Three Rivers Municipal Dr Haines |
| Butler County Regional-Hogan Field (HAO) | Hamilton | OH | Fond Du Lac County to Butler County Regional-Hogan Field |
| Range Regional (HIB) | Hibbing | MN | Fond Du Lac County to Range Regional |
| Park Township (HLM) | Holland | MI | Fond Du Lac County to Park Township |
| Huntingburg (HNB) | Huntingburg | IN | Fond Du Lac County to Huntingburg |
| Hampton Municipal (HPT) | Hampton | IA | Fond Du Lac County to Hampton Municipal |
| Roscommon County - Blodgett Memorial (HTL) | Houghton Lake | MI | Fond Du Lac County to Roscommon County - Blodgett Memorial |
| Humboldt Municipal (HUD) | Humboldt | IA | Fond Du Lac County to Humboldt Municipal |
| Terre Haute Regional (HUF) | Terre Haute | IN | Fond Du Lac County to Terre Haute Regional |
| Sawyer County (HYR) | Hayward | WI | Fond Du Lac County to Sawyer County |
| Schenck Field (ICL) | Clarinda | IA | Fond Du Lac County to Schenck Field |
| Ida Grove Municipal (IDG) | Ida Grove | IA | Fond Du Lac County to Ida Grove Municipal |
| Iowa Falls Municipal (IFA) | Iowa Falls | IA | Fond Du Lac County to Iowa Falls Municipal |
| Jacksonville Municipal (IJX) | Jacksonville | IL | Fond Du Lac County to Jacksonville Municipal |
| Greater Kankakee (IKK) | Kankakee | IL | Fond Du Lac County to Greater Kankakee |
| Willmar Municipal/John L Rice Field (ILL) | Willmar | MN | Fond Du Lac County to Willmar Municipal/John L Rice Field |
| Wilmington Airpark (ILN) | Wilmington | OH | Fond Du Lac County to Wilmington Airpark |
| Ford (IMT) | Iron Mountain | MI | Fond Du Lac County to Ford |
| Indianapolis International (IND) | Indianapolis | IN | Fond Du Lac County to Indianapolis International |
| Iowa City Municipal (IOW) | Iowa City | IA | Fond Du Lac County to Iowa City Municipal |
| Kirksville Regional (IRK) | Kirksville | MO | Fond Du Lac County to Kirksville Regional |
| Kirsch Municipal (IRS) | Sturgis | MI | Fond Du Lac County to Kirsch Municipal |
| Schoolcraft County (ISQ) | Manistique | MI | Fond Du Lac County to Schoolcraft County |
| Alexander Field South Wood County (ISW) | Wisconsin Rapids | WI | Fond Du Lac County to Alexander Field South Wood County |
| Gogebic-Iron County (IWD) | Ironwood | MI | Fond Du Lac County to Gogebic-Iron County |
| Joliet Regional Airport (JOT) | Joliet | IL | Fond Du Lac County to Joliet Regional Airport |
| Souther Wisconsin Regional (JVL) | Janesville | WI | Fond Du Lac County to Souther Wisconsin Regional |
| Jackson County/Reynolds Field (JXN) | Jackson | MI | Fond Du Lac County to Jackson County/Reynolds Field |
| Kentland Municipal (KKT) | Kentland | IN | Fond Du Lac County to Kentland Municipal |
| Purdue University (LAF) | Lafayette | IN | Fond Du Lac County to Purdue University |
| Capital Region International (LAN) | Lansing | MI | Fond Du Lac County to Capital Region International |
| Rickenbacker International (LCK) | Columbus | OH | Fond Du Lac County to Rickenbacker International |
| Mason County (LDM) | Ludington | MI | Fond Du Lac County to Mason County |
| Leamington (LM2) | Leamington | ON | Fond Du Lac County to Leamington |
| Willoughby Lost Nation Municipal (LNN) | Willoughby | OH | Fond Du Lac County to Willoughby Lost Nation Municipal |
| Tri-County Regional (LNR) | Lone Rock | WI | Fond Du Lac County to Tri-County Regional |
| Lewis University Chicago Romeoville (LOT) | Chicago/Romeoville | IL | Fond Du Lac County to Lewis University Chicago Romeoville |
| La Porte Municipal (LPO) | La Porte | IN | Fond Du Lac County to La Porte Municipal |
| Le Mars Municipal (LRJ) | Le Mars | IA | Fond Du Lac County to Le Mars Municipal |
| La Crosse Regional (LSE) | La Crosse | WI | Fond Du Lac County to La Crosse Regional |
| Cincinnati Municipal Lunken (LUK) | Cincinnati | OH | Fond Du Lac County to Cincinnati Municipal Lunken |
| Lawrenceville-Vincennes International (LWV) | Lawrenceville | IL | Fond Du Lac County to Lawrenceville-Vincennes International |
| Ely Municipal (LYU) | Ely | MN | Fond Du Lac County to Ely Municipal |
| Quentin Aanenson Field (LYV) | Luverne | MN | Fond Du Lac County to Quentin Aanenson Field |
| Manistee County-Blacker (MBL) | Manistee | MI | Fond Du Lac County to Manistee County-Blacker |
| Mbs International (MBS) | Saginaw | MI | Fond Du Lac County to Mbs International |
| Omar N Bradley (MBY) | Moberly | MO | Fond Du Lac County to Omar N Bradley |
| Mackinac Island (MCD) | Mackinac Island | MI | Fond Du Lac County to Mackinac Island |
| Mason City Municipal (MCW) | Mason City | IA | Fond Du Lac County to Mason City Municipal |
| Taylor County (MDF) | Medford | WI | Fond Du Lac County to Taylor County |
| Madison Municipal (MDN) | Madison | IN | Fond Du Lac County to Madison Municipal |
| Chicago Midway International (MDW) | Chicago | IL | Fond Du Lac County to Chicago Midway International |
| Mansfield Lahm Regional (MFD) | Mansfield | OH | Fond Du Lac County to Mansfield Lahm Regional |
| Marshfield Municipal (MFI) | Marshfield | WI | Fond Du Lac County to Marshfield Municipal |
| Michigan City Municipal-Phillips Field (MGC) | Michigan City | IN | Fond Du Lac County to Michigan City Municipal-Phillips Field |
| Dayton-Wright Brothers (MGY) | Dayton | OH | Fond Du Lac County to Dayton-Wright Brothers |
| Marshall Memorial Municipal (MHL) | Marshall | MO | Fond Du Lac County to Marshall Memorial Municipal |
| Crystal (MIC) | Minneapolis | MN | Fond Du Lac County to Crystal |
| Delaware County Regional (MIE) | Muncie | IN | Fond Du Lac County to Delaware County Regional |
| Marshalltown Municipal (MIW) | Marshalltown | IA | Fond Du Lac County to Marshalltown Municipal |
| Jackson Municipal (MJQ) | Jackson | MN | Fond Du Lac County to Jackson Municipal |
| Milwaukee Mitchell International (MKE) | Milwaukee | WI | Fond Du Lac County to Milwaukee Mitchell International |
| Muskegon County (MKG) | Muskegon | MI | Fond Du Lac County to Muskegon County |
| Mankato Regional (MKT) | Mankato | MN | Fond Du Lac County to Mankato Regional |
| Quad City International (MLI) | Moline | IL | Fond Du Lac County to Quad City International |
| Southwest Minnesota Regional Marshall/Ryan Field (MML) | Marshall | MN | Fond Du Lac County to Southwest Minnesota Regional Marshall/Ryan Field |
| Menominee-Marinette Twin County (MNM) | Menominee | MI | Fond Du Lac County to Menominee-Marinette Twin County |
| Marion Municipal (MNN) | Marion | OH | Fond Du Lac County to Marion Municipal |
| Mount Pleasant Municipal (MOP) | Mount Pleasant | MI | Fond Du Lac County to Mount Pleasant Municipal |
| Morris Municipal/Charlie Schmidt Field (MOX) | Morris | MN | Fond Du Lac County to Morris Municipal/Charlie Schmidt Field |
| Mount Pleasant Municipal (MPZ) | Mount Pleasant | IA | Fond Du Lac County to Mount Pleasant Municipal |
| Macomb Municipal (MQB) | Macomb | IL | Fond Du Lac County to Macomb Municipal |
| Sawyer International (MQT) | Marquette | MI | Fond Du Lac County to Sawyer International |
| Truax Field/Dane County Regional (MSN) | Madison | WI | Fond Du Lac County to Truax Field/Dane County Regional |
| Minneapolis St Paul International/Wold-Chamberlain (MSP) | Minneapolis | MN | Fond Du Lac County to Minneapolis St Paul International/Wold-Chamberlain |
| Coles County Memorial (MTO) | Mattoon/Charleston | IL | Fond Du Lac County to Coles County Memorial |
| Manitowoc County (MTW) | Manitowoc | WI | Fond Du Lac County to Manitowoc County |
| Muscatine Municipal (MUT) | Muscatine | IA | Fond Du Lac County to Muscatine Municipal |
| Montevideo-Chippewa County (MVE) | Montevideo | MN | Fond Du Lac County to Montevideo-Chippewa County |
| Mount Vernon (MVN) | Mount Vernon | IL | Fond Du Lac County to Mount Vernon |
| Lawrence J Timmerman (MWC) | Milwaukee | WI | Fond Du Lac County to Lawrence J Timmerman |
| Windom Municipal (MWM) | Windom | MN | Fond Du Lac County to Windom Municipal |
| Middletown Regional - Hook Field (MWO) | Middletown | OH | Fond Du Lac County to Middletown Regional - Hook Field |
| Monticello Regional (MXO) | Monticello | IA | Fond Du Lac County to Monticello Regional |
| Marion Municipal (MZZ) | Marion | IN | Fond Du Lac County to Marion Municipal |
| Jerry Tyler Memorial (NLE) | Niles | MI | Fond Du Lac County to Jerry Tyler Memorial |
| Tobermory (NR4) | Tobermory | ON | Fond Du Lac County to Tobermory |
| Slayton Municipal (NSL) | Slayton | MN | Fond Du Lac County to Slayton Municipal |
| L O Simenstad Municipal (OEO) | Osceola | WI | Fond Du Lac County to L O Simenstad Municipal |
| Kokomo Municipal (OKK) | Kokomo | IN | Fond Du Lac County to Kokomo Municipal |
| Olney-Noble (OLY) | Olney-Noble | IL | Fond Du Lac County to Olney-Noble |
| Winona Municipal-Max Conrad Field (ONA) | Winona | MN | Fond Du Lac County to Winona Municipal-Max Conrad Field |
| Oskaloosa Municipal (OOA) | Oskaloosa | IA | Fond Du Lac County to Oskaloosa Municipal |
| Chicago O'hare International (ORD) | Chicago | IL | Fond Du Lac County to Chicago O'hare International |
| Oscoda-Wurtsmith (OSC) | Oscoda | MI | Fond Du Lac County to Oscoda-Wurtsmith |
| Ohio State University (OSU) | Columbus | OH | Fond Du Lac County to Ohio State University |
| Worthington Municipal (OTG) | Worthington | MN | Fond Du Lac County to Worthington Municipal |
| Ottumwa Regional (OTM) | Ottumwa | IA | Fond Du Lac County to Ottumwa Regional |
| Owatonna Degner Regional (OWA) | Owatonna | MN | Fond Du Lac County to Owatonna Degner Regional |
| Miami University (OXD) | Oxford | OH | Fond Du Lac County to Miami University |
| Prairie Du Chien Municipal (PCD) | Prairie Duchien | WI | Fond Du Lac County to Prairie Du Chien Municipal |
| St Clair County International (PHN) | Port Huron | MI | Fond Du Lac County to St Clair County International |
| Gen Wayne A Downing Peoria International (PIA) | Peoria | IL | Fond Du Lac County to Gen Wayne A Downing Peoria International |
| Park Rapids Municipal-Konshok Field (PKD) | Park Rapids | MN | Fond Du Lac County to Park Rapids Municipal-Konshok Field |
| Park Falls Municipal (PKF) | Park Falls | WI | Fond Du Lac County to Park Falls Municipal |
| Pellston Regional of Emmet County (PLN) | Pellston | MI | Fond Du Lac County to Pellston Regional of Emmet County |
| Plymouth Municipal (PLY) | Plymouth | IN | Fond Du Lac County to Plymouth Municipal |
| Pocahontas Municipal (POH) | Pocahontas | IA | Fond Du Lac County to Pocahontas Municipal |
| Wingham/Richard W Levan (PR7) | Wingham | ON | Fond Du Lac County to Wingham/Richard W Levan |
| Perry Municipal (PRO) | Perry | IA | Fond Du Lac County to Perry Municipal |
| Prentice Municipal (PRW) | Prentice | WI | Fond Du Lac County to Prentice Municipal |
| Killarney (PT2) | Killarney | ON | Fond Du Lac County to Killarney |
| Oakland County International (PTK) | Pontiac | MI | Fond Du Lac County to Oakland County International |
| Chicago Executive (PWK) | Chicago | IL | Fond Du Lac County to Chicago Executive |
| Batten International (RAC) | Racine | WI | Fond Du Lac County to Batten International |
| Fulton County (RCR) | Rochester | IN | Fond Du Lac County to Fulton County |
| Nartron Field (RCT) | Reed City | MI | Fond Du Lac County to Nartron Field |
| Chicago/Rockford International (RFD) | Rockford | IL | Fond Du Lac County to Chicago/Rockford International |
| Rhinelander Oneida County (RHI) | Rhinelander | WI | Fond Du Lac County to Rhinelander Oneida County |
| Richmond Municipal (RID) | Richmond | IN | Fond Du Lac County to Richmond Municipal |
| Rice Lake Regional - Carl's Field (RIE) | Rice Lake | WI | Fond Du Lac County to Rice Lake Regional - Carl's Field |
| New Richmond Regional (RNH) | New Richmond | WI | Fond Du Lac County to New Richmond Regional |
| Jasper County (RNZ) | Rensselaer | IN | Fond Du Lac County to Jasper County |
| Merrill Municipal (RRL) | Merrill | WI | Fond Du Lac County to Merrill Municipal |
| Rochester International (RST) | Rochester | MN | Fond Du Lac County to Rochester International |
| Spirit Lake Municipal (RTL) | Spirit Lake | IA | Fond Du Lac County to Spirit Lake Municipal |
| Redwood Falls Municipal (RWF) | Redwood Falls | MN | Fond Du Lac County to Redwood Falls Municipal |
| Sparta Community - Hunter Field (SAR) | Sparta | IL | Fond Du Lac County to Sparta Community - Hunter Field |
| South Bend International (SBN) | South Bend | IN | Fond Du Lac County to South Bend International |
| Freeman Municipal (SER) | Seymour | IN | Fond Du Lac County to Freeman Municipal |
| Springfield/Beckley Municipal (SGH) | Springfield | OH | Fond Du Lac County to Springfield/Beckley Municipal |
| Sullivan County (SIV) | Sullivan | IN | Fond Du Lac County to Sullivan County |
| Storm Lake Municipal (SLB) | Storm Lake | IA | Fond Du Lac County to Storm Lake Municipal |
| Salem-Leckrone (SLO) | Salem | IL | Fond Du Lac County to Salem-Leckrone |
| Smith Field (SMD) | Fort Wayne | IN | Fond Du Lac County to Smith Field |
| Abraham Lincoln Capital (SPI) | Springfield | IL | Fond Du Lac County to Abraham Lincoln Capital |
| Spencer Municipal/Northwest Iowa Regional (SPW) | Spencer | IA | Fond Du Lac County to Spencer Municipal/Northwest Iowa Regional |
| Whiteside Co/Jos H Bittorf Field (SQI) | Sterling/Rock Falls | IL | Fond Du Lac County to Whiteside Co/Jos H Bittorf Field |
| St Cloud Regional (STC) | St Cloud Regional | MN | Fond Du Lac County to St Cloud Regional |
| Stevens Point Municipal (STE) | Stevens Point | WI | Fond Du Lac County to Stevens Point Municipal |
| Lambert St Louis International (STL) | St Louis | MO | Fond Du Lac County to Lambert St Louis International |
| St Paul Downtown Holman Field (STP) | St Paul | MN | Fond Du Lac County to St Paul Downtown Holman Field |
| Door County Cherryland (SUE) | Sturgeon Bay | WI | Fond Du Lac County to Door County Cherryland |
| Spirit of St Louis (SUS) | St Louis | MO | Fond Du Lac County to Spirit of St Louis |
| Richard I Bong Memorial (SUW) | Superior | WI | Fond Du Lac County to Richard I Bong Memorial |
| Toledo Executive (TDZ) | Toledo | OH | Fond Du Lac County to Toledo Executive |
| Newton Municipal (TNU) | Newton | IA | Fond Du Lac County to Newton Municipal |
| Toledo Express (TOL) | Toledo | OH | Fond Du Lac County to Toledo Express |
| Trenton Municipal (TRX) | Trenton | MO | Fond Du Lac County to Trenton Municipal |
| Cherry Capital (TVC) | Traverse City | MI | Fond Du Lac County to Cherry Capital |
| Tuscola Area (TZC) | Caro | MI | Fond Du Lac County to Tuscola Area |
| Waukesha County (UES) | Waukesha | WI | Fond Du Lac County to Waukesha County |
| Chicago/Waukegan Regional (UGN) | Chicago | IL | Fond Du Lac County to Chicago/Waukegan Regional |
| Baldwin Field/Quincy Regional (UIN) | Quincy | IL | Fond Du Lac County to Baldwin Field/Quincy Regional |
| Waukon Municipal Airport (UKN) | Waukon | IA | Fond Du Lac County to Waukon Municipal Airport |
| New Ulm Municipal (ULM) | New Ulm | MN | Fond Du Lac County to New Ulm Municipal |
| Vandalia Municipal (VLA) | Vandalia | IL | Fond Du Lac County to Vandalia Municipal |
| Porter County Regional (VPZ) | Valparaiso | IN | Fond Du Lac County to Porter County Regional |
| Walter A Duncan Field/Illinois Valley Regional (VYS) | Peru | IL | Fond Du Lac County to Walter A Duncan Field/Illinois Valley Regional |
| West Branch Community (WBK) | West Branch | MI | Fond Du Lac County to West Branch Community |
| Roben-Hood (WBR) | Big Rapids | MI | Fond Du Lac County to Roben-Hood |
| Grand Geneva Resort (XES) | Lake Geneva | WI | Fond Du Lac County to Grand Geneva Resort |
| Sault Ste Marie (YAM) | Sault Ste Marie | ON | Fond Du Lac County to Sault Ste Marie |
| Centralia/James T Field Memorial (YCE) | Centralia | ON | Fond Du Lac County to Centralia/James T Field Memorial |
| Chatham-Kent Municipal (YCK) | Chatham | ON | Fond Du Lac County to Chatham-Kent Municipal |
| Bar River (YEB) | Bar River | ON | Fond Du Lac County to Bar River |
| Elliot Lake Municipal (YEL) | Elliot Lake | ON | Fond Du Lac County to Elliot Lake Municipal |
| Manitowaning Manitoulin East Municipal (YEM) | Manitowaning | ON | Fond Du Lac County to Manitowaning Manitoulin East Municipal |
| Goderich Municipal (YGD) | Goderich | ON | Fond Du Lac County to Goderich Municipal |
| Saugeen Municipal (YHS) | Hanover | ON | Fond Du Lac County to Saugeen Municipal |
| Atikokan Municipal (YIB) | Atikokan | ON | Fond Du Lac County to Atikokan Municipal |
| Willow Run (YIP) | Detroit | MI | Fond Du Lac County to Willow Run |
| Kincardine (YKD) | Kincardine | ON | Fond Du Lac County to Kincardine |
| Chapleau (YLD) | Chapleau | ON | Fond Du Lac County to Chapleau |
| Manitouwadge Municipal (YMG) | Manitouwadge | ON | Fond Du Lac County to Manitouwadge Municipal |
| Owen Sound - Billy Bishop Regional (YOS) | Owen Sound | ON | Fond Du Lac County to Owen Sound - Billy Bishop Regional |
| Pelee Island (YPT) | Pelee Island | ON | Fond Du Lac County to Pelee Island |
| Windsor (YQG) | Windsor | ON | Fond Du Lac County to Windsor |
| St Thomas Municipal (YQS) | St Thomas | ON | Fond Du Lac County to St Thomas Municipal |
| Thunder Bay (YQT) | Thunder Bay | ON | Fond Du Lac County to Thunder Bay |
| Stratford Municipal (YSA) | Stratford | ON | Fond Du Lac County to Stratford Municipal |
| Marathon (YSP) | Marathon | ON | Fond Du Lac County to Marathon |
| Wiarton (YVV) | Wiarton | ON | Fond Du Lac County to Wiarton |
| London (YXU) | London | ON | Fond Du Lac County to London |
| Wawa Municipal (YXZ) | Wawa | ON | Fond Du Lac County to Wawa Municipal |
| Gore Bay Manitoulin (YZE) | Gore Bay | ON | Fond Du Lac County to Gore Bay Manitoulin |
| Sarnia/Chris Hadfield (YZR) | Sarnia | ON | Fond Du Lac County to Sarnia/Chris Hadfield |
