| Aberdeen Regional (ABR) | Aberdeen | SD | Marshalltown Municipal to Aberdeen Regional |
| Albert Lea Municipal (AEL) | Albert Lea | MN | Marshalltown Municipal to Albert Lea Municipal |
| Arapahoe Municipal (AHF) | Arapahoe | NE | Marshalltown Municipal to Arapahoe Municipal |
| Amery Municipal (AHH) | Amery | WI | Marshalltown Municipal to Amery Municipal |
| Anderson Municipal-Darlington Field (AID) | Anderson | IN | Marshalltown Municipal to Anderson Municipal-Darlington Field |
| Atlantic Municipal (AIO) | Atlantic | IA | Marshalltown Municipal to Atlantic Municipal |
| Lee C Fine Memorial (AIZ) | KAISER/LAKE OZARK | MO | Marshalltown Municipal to Lee C Fine Memorial |
| St Louis Regional (ALN) | Alton | IL | Marshalltown Municipal to St Louis Regional |
| Ainsworth Regional (ANW) | Ainsworth | NE | Marshalltown Municipal to Ainsworth Regional |
| Lakeland/Noble F. Lee Memorial Field (ARV) | Minocqua | WI | Marshalltown Municipal to Lakeland/Noble F. Lee Memorial Field |
| John F Kennedy Memorial (ASX) | Ashland | WI | Marshalltown Municipal to John F Kennedy Memorial |
| Appleton International (ATW) | Appleton | WI | Marshalltown Municipal to Appleton International |
| Watertown Regional (ATY) | Watertown | SD | Marshalltown Municipal to Watertown Regional |
| Austin Municipal (AUM) | Austin | MN | Marshalltown Municipal to Austin Municipal |
| Wausau Downtown (AUW) | Wausau | WI | Marshalltown Municipal to Wausau Downtown |
| Chicago/Aurora Municipal (AUZ) | Chicago | IL | Marshalltown Municipal to Chicago/Aurora Municipal |
| Algona Municipal (AXG) | Algona | IA | Marshalltown Municipal to Algona Municipal |
| Chandler Field (AXN) | Alexandria | MN | Marshalltown Municipal to Chandler Field |
| Kalamazoo/Battle Creek International (AZO) | Kalamazoo | MI | Marshalltown Municipal to Kalamazoo/Battle Creek International |
| Benson Municipal (BBB) | Benson | MN | Marshalltown Municipal to Benson Municipal |
| Broken Bow Municipal/Keith Glaze Field (BBW) | Broken Bow | NE | Marshalltown Municipal to Broken Bow Municipal/Keith Glaze Field |
| Beech Factory (BEC) | Wichita | KS | Marshalltown Municipal to Beech Factory |
| Southwest Michigan Regional (BEH) | Benton Harbor | MI | Marshalltown Municipal to Southwest Michigan Regional |
| Beatrice Municipal (BIE) | Beatrice | NE | Marshalltown Municipal to Beatrice Municipal |
| Bemidji Regional (BJI) | Bemidji | MN | Marshalltown Municipal to Bemidji Regional |
| Branson (BKG) | Branson | MO | Marshalltown Municipal to Branson |
| Brookings Regional (BKX) | Brookings | SD | Marshalltown Municipal to Brookings Regional |
| MidAmerica St Louis Scott AFB (BLV) | Belleville | IL | Marshalltown Municipal to MidAmerica St Louis Scott AFB |
| Monroe County (BMG) | Bloomington | IN | Marshalltown Municipal to Monroe County |
| Central Illinois Regional at Bloomington Normal (BMI) | Bloomington | IL | Marshalltown Municipal to Central Illinois Regional at Bloomington Normal |
| Boone Municipal (BNW) | Boone | IA | Marshalltown Municipal to Boone Municipal |
| Brainerd Lakes Regional (BRD) | Brainerd | MN | Marshalltown Municipal to Brainerd Lakes Regional |
| Southeast Iowa Regional (BRL) | Burlington | IA | Marshalltown Municipal to Southeast Iowa Regional |
| Battle Creek Executive (BTL) | Battle Creek | MI | Marshalltown Municipal to Battle Creek Executive |
| Cram Field (BUB) | Burwell | NE | Marshalltown Municipal to Cram Field |
| Butler Memorial (BUM) | Butler | MO | Marshalltown Municipal to Butler Memorial |
| Wexford County (CAD) | Cadillac | MI | Marshalltown Municipal to Wexford County |
| Council Bluffs Municipal (CBF) | Council Bluffs | IA | Marshalltown Municipal to Council Bluffs Municipal |
| Northeast Iowa Regional (CCY) | Charles City | IA | Marshalltown Municipal to Northeast Iowa Regional |
| Cessna Aircraft Field (CEA) | Wichita | KS | Marshalltown Municipal to Cessna Aircraft Field |
| Coffeyville Municipal (CFV) | Coffeyville | KS | Marshalltown Municipal to Coffeyville Municipal |
| Cape Girardeau Regional (CGI) | Cape Girardeau | MO | Marshalltown Municipal to Cape Girardeau Regional |
| The Eastern Iowa (CID) | Cedar Rapids | IA | Marshalltown Municipal to The Eastern Iowa |
| Arthur N Neu (CIN) | Carroll | IA | Marshalltown Municipal to Arthur N Neu |
| Cairo Regional (CIR) | Cairo | IL | Marshalltown Municipal to Cairo Regional |
| Clintonville Municipal (CLI) | Clintonville | WI | Marshalltown Municipal to Clintonville Municipal |
| University of Illinois-Willard (CMI) | Champaign/Urbana | IL | Marshalltown Municipal to University of Illinois-Willard |
| Sparta/Fort Mccoy (CMY) | Sparta | WI | Marshalltown Municipal to Sparta/Fort Mccoy |
| Blosser Municipal (CNK) | Concordia | KS | Marshalltown Municipal to Blosser Municipal |
| Chanute Martin Johnson (CNU) | Chanute | KS | Marshalltown Municipal to Chanute Martin Johnson |
| Columbia Regional (COU) | Columbia | MO | Marshalltown Municipal to Columbia Regional |
| St Louis Downtown (CPS) | Cahokia/St Louis | IL | Marshalltown Municipal to St Louis Downtown |
| Creston Municipal (CSQ) | Creston | IA | Marshalltown Municipal to Creston Municipal |
| Canton Municipal (CTK) | Canton | SD | Marshalltown Municipal to Canton Municipal |
| Central Wisconsin (CWA) | Mosinee | WI | Marshalltown Municipal to Central Wisconsin |
| Clinton Municipal (CWI) | Clinton | IA | Marshalltown Municipal to Clinton Municipal |
| Dubuque Regional (DBQ) | Dubuque | IA | Marshalltown Municipal to Dubuque Regional |
| Decatur (DEC) | Decatur | IL | Marshalltown Municipal to Decatur |
| Decorah Municipal (DEH) | Decorah | IA | Marshalltown Municipal to Decorah Municipal |
| Duluth International (DLH) | Duluth | MN | Marshalltown Municipal to Duluth International |
| Sedalia Regional (DMO) | Sedalia | MO | Marshalltown Municipal to Sedalia Regional |
| Denison Municipal (DNS) | Denison | IA | Marshalltown Municipal to Denison Municipal |
| Vermilion Regional (DNV) | Danville | IL | Marshalltown Municipal to Vermilion Regional |
| Dupage (DPA) | Chicago | IL | Marshalltown Municipal to Dupage |
| Des Moines International (DSM) | Des Moines | IA | Marshalltown Municipal to Des Moines International |
| Detroit Lakes-Wething Field (DTL) | Detroit Lakes | MN | Marshalltown Municipal to Detroit Lakes-Wething Field |
| Davenport Municipal (DVN) | Davenport | IA | Marshalltown Municipal to Davenport Municipal |
| Kearney Regional (EAR) | Kearney | NE | Marshalltown Municipal to Kearney Regional |
| Chippewa Valley Regional (EAU) | Eau Claire | WI | Marshalltown Municipal to Chippewa Valley Regional |
| Webster City Municipal (EBS) | Webster City | IA | Marshalltown Municipal to Webster City Municipal |
| El Dorado/Captain Jack Thomas Memorial (EDK) | El Dorado | KS | Marshalltown Municipal to El Dorado/Captain Jack Thomas Memorial |
| Jefferson Municipal (EFW) | Jefferson | IA | Marshalltown Municipal to Jefferson Municipal |
| Eagle River Union (EGV) | Eagle River | WI | Marshalltown Municipal to Eagle River Union |
| Elkhart Municipal (EKI) | Elkhart | IN | Marshalltown Municipal to Elkhart Municipal |
| Emporia Municipal (EMP) | Emporia | KS | Marshalltown Municipal to Emporia Municipal |
| Centralia Municipal (ENL) | Centralia | IL | Marshalltown Municipal to Centralia Municipal |
| Kenosha Regional (ENW) | Kenosha | WI | Marshalltown Municipal to Kenosha Regional |
| Keokuk Municipal (EOK) | Keokuk | IA | Marshalltown Municipal to Keokuk Municipal |
| Neosho Hugh Robinson (EOS) | Neosho | MO | Marshalltown Municipal to Neosho Hugh Robinson |
| Delta County (ESC) | Escanaba | MI | Marshalltown Municipal to Delta County |
| Estherville Municipal (EST) | Estherville | IA | Marshalltown Municipal to Estherville Municipal |
| West Bend Municipal (ETB) | West Bend | WI | Marshalltown Municipal to West Bend Municipal |
| Eveleth-Virginia Municipal (EVM) | Eveleth | MN | Marshalltown Municipal to Eveleth-Virginia Municipal |
| Evansville Regional (EVV) | Evansville | IN | Marshalltown Municipal to Evansville Regional |
| Newton City County (EWK) | Newton | KS | Marshalltown Municipal to Newton City County |
| Farmington Regional (FAM) | Farmington | MO | Marshalltown Municipal to Farmington Regional |
| Hector International Fargo (FAR) | Fargo | ND | Marshalltown Municipal to Hector International Fargo |
| Faribault Municipal (FBL) | Faribault | MN | Marshalltown Municipal to Faribault Municipal |
| Fairbury Municipal (FBY) | Fairbury | NE | Marshalltown Municipal to Fairbury Municipal |
| Flying Cloud (FCM) | Minneapolis | MN | Marshalltown Municipal to Flying Cloud |
| Albertus (FEP) | Freeport | IL | Marshalltown Municipal to Albertus |
| Fremont Municipal (FET) | Fremont | NE | Marshalltown Municipal to Fremont Municipal |
| Fairfield Municipal (FFL) | Fairfield | IA | Marshalltown Municipal to Fairfield Municipal |
| Fergus Falls Municipal-Einar Mickelson Field (FFM) | Fergus Falls | MN | Marshalltown Municipal to Fergus Falls Municipal-Einar Mickelson Field |
| Fond Du Lac County (FLD) | Fond Du Lac | WI | Marshalltown Municipal to Fond Du Lac County |
| Sherman Army Airfield (FLV) | Fort Leavenworth | KS | Marshalltown Municipal to Sherman Army Airfield |
| Fort Madison Municipal (FMS) | Fort Madison | IA | Marshalltown Municipal to Fort Madison Municipal |
| Fort Dodge Regional (FOD) | Fort Dodge | IA | Marshalltown Municipal to Fort Dodge Regional |
| Topeka Regional (FOE) | Topeka | KS | Marshalltown Municipal to Topeka Regional |
| Fairmont Municipal (FRM) | Fairmont | MN | Marshalltown Municipal to Fairmont Municipal |
| Sioux Falls Regional, Joe Foss Field (FSD) | Sioux Falls | SD | Marshalltown Municipal to Sioux Falls Regional, Joe Foss Field |
| Fort Scott Municipal (FSK) | Fort Scott | KS | Marshalltown Municipal to Fort Scott Municipal |
| Branson West Municipal - Emerson Field (FWB) | Branson West | MO | Marshalltown Municipal to Branson West Municipal - Emerson Field |
| Forest City Municipal (FXY) | Forest City | IA | Marshalltown Municipal to Forest City Municipal |
| Galesburg Municipal (GBG) | Galesburg | IL | Marshalltown Municipal to Galesburg Municipal |
| Grand Rapids/Itasca County-Gordon Newstrom Field (GPZ) | Grand Rapids | MN | Marshalltown Municipal to Grand Rapids/Itasca County-Gordon Newstrom Field |
| Austin Straubel International (GRB) | Green Bay | WI | Marshalltown Municipal to Austin Straubel International |
| Greenville (GRE) | Greenville | IL | Marshalltown Municipal to Greenville |
| Central Nebraska Regional (GRI) | Grand Island | NE | Marshalltown Municipal to Central Nebraska Regional |
| Gerald R Ford International (GRR) | Grand Rapids | MI | Marshalltown Municipal to Gerald R Ford International |
| Goshen Municipal (GSH) | Goshen | IN | Marshalltown Municipal to Goshen Municipal |
| Grantsburg Muni (GTG) | Grantsburg | WI | Marshalltown Municipal to Grantsburg Muni |
| Grissom Aeroplex/Arb (GUS) | Peru | IN | Marshalltown Municipal to Grissom Aeroplex/Arb |
| Gary/Chicago International (GYY) | GARY | IN | Marshalltown Municipal to Gary/Chicago International |
| Three Rivers Municipal Dr Haines (HAI) | Three Rivers | MI | Marshalltown Municipal to Three Rivers Municipal Dr Haines |
| Brewster Field (HDE) | Holdrege | NE | Marshalltown Municipal to Brewster Field |
| Range Regional (HIB) | Hibbing | MN | Marshalltown Municipal to Range Regional |
| Park Township (HLM) | Holland | MI | Marshalltown Municipal to Park Township |
| Huron Regional (HON) | Huron | SD | Marshalltown Municipal to Huron Regional |
| Hampton Municipal (HPT) | Hampton | IA | Marshalltown Municipal to Hampton Municipal |
| Harrisburg-Raleigh (HSB) | Harrisburg | IL | Marshalltown Municipal to Harrisburg-Raleigh |
| Hastings Municipal (HSI) | Hastings | NE | Marshalltown Municipal to Hastings Municipal |
| Humboldt Municipal (HUD) | Humboldt | IA | Marshalltown Municipal to Humboldt Municipal |
| Terre Haute Regional (HUF) | Terre Haute | IN | Marshalltown Municipal to Terre Haute Regional |
| Hutchinson Regional (HUT) | Hutchinson | KS | Marshalltown Municipal to Hutchinson Regional |
| Sawyer County (HYR) | Hayward | WI | Marshalltown Municipal to Sawyer County |
| Hays Regional (HYS) | Hays | KS | Marshalltown Municipal to Hays Regional |
| Schenck Field (ICL) | Clarinda | IA | Marshalltown Municipal to Schenck Field |
| Wichita Eisenhower National (ICT) | Wichita | KS | Marshalltown Municipal to Wichita Eisenhower National |
| Ida Grove Municipal (IDG) | Ida Grove | IA | Marshalltown Municipal to Ida Grove Municipal |
| Independence Municipal (IDP) | Independence | KS | Marshalltown Municipal to Independence Municipal |
| Jacksonville Municipal (IJX) | Jacksonville | IL | Marshalltown Municipal to Jacksonville Municipal |
| Greater Kankakee (IKK) | Kankakee | IL | Marshalltown Municipal to Greater Kankakee |
| Willmar Municipal/John L Rice Field (ILL) | Willmar | MN | Marshalltown Municipal to Willmar Municipal/John L Rice Field |
| Ford (IMT) | Iron Mountain | MI | Marshalltown Municipal to Ford |
| Indianapolis International (IND) | Indianapolis | IN | Marshalltown Municipal to Indianapolis International |
| Iowa City Municipal (IOW) | Iowa City | IA | Marshalltown Municipal to Iowa City Municipal |
| Kirksville Regional (IRK) | Kirksville | MO | Marshalltown Municipal to Kirksville Regional |
| Kirsch Municipal (IRS) | Sturgis | MI | Marshalltown Municipal to Kirsch Municipal |
| Alexander Field South Wood County (ISW) | Wisconsin Rapids | WI | Marshalltown Municipal to Alexander Field South Wood County |
| Gogebic-Iron County (IWD) | Ironwood | MI | Marshalltown Municipal to Gogebic-Iron County |
| New Century Aircenter (JCI) | Olathe | KS | Marshalltown Municipal to New Century Aircenter |
| Jefferson City Memorial (JEF) | Jefferson City | MO | Marshalltown Municipal to Jefferson City Memorial |
| Joplin Regional (JLN) | Joplin | MO | Marshalltown Municipal to Joplin Regional |
| Joliet Regional Airport (JOT) | Joliet | IL | Marshalltown Municipal to Joliet Regional Airport |
| Souther Wisconsin Regional (JVL) | Janesville | WI | Marshalltown Municipal to Souther Wisconsin Regional |
| Kentland Municipal (KKT) | Kentland | IN | Marshalltown Municipal to Kentland Municipal |
| Purdue University (LAF) | Lafayette | IN | Marshalltown Municipal to Purdue University |
| Mason County (LDM) | Ludington | MI | Marshalltown Municipal to Mason County |
| Lincoln Municipal (LNK) | Lincoln | NE | Marshalltown Municipal to Lincoln Municipal |
| Tri-County Regional (LNR) | Lone Rock | WI | Marshalltown Municipal to Tri-County Regional |
| Lewis University Chicago Romeoville (LOT) | Chicago/Romeoville | IL | Marshalltown Municipal to Lewis University Chicago Romeoville |
| La Porte Municipal (LPO) | La Porte | IN | Marshalltown Municipal to La Porte Municipal |
| Le Mars Municipal (LRJ) | Le Mars | IA | Marshalltown Municipal to Le Mars Municipal |
| La Crosse Regional (LSE) | La Crosse | WI | Marshalltown Municipal to La Crosse Regional |
| Lawrence Municipal (LWC) | Lawrence | KS | Marshalltown Municipal to Lawrence Municipal |
| Lawrenceville-Vincennes International (LWV) | Lawrenceville | IL | Marshalltown Municipal to Lawrenceville-Vincennes International |
| Jim Kelly Field (LXN) | Lexington | NE | Marshalltown Municipal to Jim Kelly Field |
| Lyons-Rice County Muni (LYO) | Lyons | KS | Marshalltown Municipal to Lyons-Rice County Muni |
| Ely Municipal (LYU) | Ely | MN | Marshalltown Municipal to Ely Municipal |
| Quentin Aanenson Field (LYV) | Luverne | MN | Marshalltown Municipal to Quentin Aanenson Field |
| Manistee County-Blacker (MBL) | Manistee | MI | Marshalltown Municipal to Manistee County-Blacker |
| Omar N Bradley (MBY) | Moberly | MO | Marshalltown Municipal to Omar N Bradley |
| Kansas City International (MCI) | Kansas City | MO | Marshalltown Municipal to Kansas City International |
| Mason City Municipal (MCW) | Mason City | IA | Marshalltown Municipal to Mason City Municipal |
| Taylor County (MDF) | Medford | WI | Marshalltown Municipal to Taylor County |
| Southern Illinois (MDH) | Carbondale/Murphysboro | IL | Marshalltown Municipal to Southern Illinois |
| Chicago Midway International (MDW) | Chicago | IL | Marshalltown Municipal to Chicago Midway International |
| Marshfield Municipal (MFI) | Marshfield | WI | Marshalltown Municipal to Marshfield Municipal |
| Michigan City Municipal-Phillips Field (MGC) | Michigan City | IN | Marshalltown Municipal to Michigan City Municipal-Phillips Field |
| Mitchell Municipal (MHE) | Mitchell | SD | Marshalltown Municipal to Mitchell Municipal |
| Manhattan Regional (MHK) | Manhattan | KS | Marshalltown Municipal to Manhattan Regional |
| Marshall Memorial Municipal (MHL) | Marshall | MO | Marshalltown Municipal to Marshall Memorial Municipal |
| Crystal (MIC) | Minneapolis | MN | Marshalltown Municipal to Crystal |
| Miami Regional (MIO) | Miami | OK | Marshalltown Municipal to Miami Regional |
| Omaha Millard (MIQ) | Omaha | NE | Marshalltown Municipal to Omaha Millard |
| Jackson Municipal (MJQ) | Jackson | MN | Marshalltown Municipal to Jackson Municipal |
| Charles B Wheeler Downtown (MKC) | Kansas City | MO | Marshalltown Municipal to Charles B Wheeler Downtown |
| Milwaukee Mitchell International (MKE) | Milwaukee | WI | Marshalltown Municipal to Milwaukee Mitchell International |
| Muskegon County (MKG) | Muskegon | MI | Marshalltown Municipal to Muskegon County |
| Mankato Regional (MKT) | Mankato | MN | Marshalltown Municipal to Mankato Regional |
| Quad City International (MLI) | Moline | IL | Marshalltown Municipal to Quad City International |
| Southwest Minnesota Regional Marshall/Ryan Field (MML) | Marshall | MN | Marshalltown Municipal to Southwest Minnesota Regional Marshall/Ryan Field |
| Menominee-Marinette Twin County (MNM) | Menominee | MI | Marshalltown Municipal to Menominee-Marinette Twin County |
| Morris Municipal/Charlie Schmidt Field (MOX) | Morris | MN | Marshalltown Municipal to Morris Municipal/Charlie Schmidt Field |
| Mcpherson (MPR) | McPherson | KS | Marshalltown Municipal to Mcpherson |
| Mount Pleasant Municipal (MPZ) | Mount Pleasant | IA | Marshalltown Municipal to Mount Pleasant Municipal |
| Macomb Municipal (MQB) | Macomb | IL | Marshalltown Municipal to Macomb Municipal |
| Sawyer International (MQT) | Marquette | MI | Marshalltown Municipal to Sawyer International |
| Truax Field/Dane County Regional (MSN) | Madison | WI | Marshalltown Municipal to Truax Field/Dane County Regional |
| Minneapolis St Paul International/Wold-Chamberlain (MSP) | Minneapolis | MN | Marshalltown Municipal to Minneapolis St Paul International/Wold-Chamberlain |
| Coles County Memorial (MTO) | Mattoon/Charleston | IL | Marshalltown Municipal to Coles County Memorial |
| Manitowoc County (MTW) | Manitowoc | WI | Marshalltown Municipal to Manitowoc County |
| Muscatine Municipal (MUT) | Muscatine | IA | Marshalltown Municipal to Muscatine Municipal |
| Montevideo-Chippewa County (MVE) | Montevideo | MN | Marshalltown Municipal to Montevideo-Chippewa County |
| Mount Vernon (MVN) | Mount Vernon | IL | Marshalltown Municipal to Mount Vernon |
| Williamson County Rgnl (MWA) | Marion | IL | Marshalltown Municipal to Williamson County Rgnl |
| Lawrence J Timmerman (MWC) | Milwaukee | WI | Marshalltown Municipal to Lawrence J Timmerman |
| Windom Municipal (MWM) | Windom | MN | Marshalltown Municipal to Windom Municipal |
| Monticello Regional (MXO) | Monticello | IA | Marshalltown Municipal to Monticello Regional |
| Marion Municipal (MZZ) | Marion | IN | Marshalltown Municipal to Marion Municipal |
| Jerry Tyler Memorial (NLE) | Niles | MI | Marshalltown Municipal to Jerry Tyler Memorial |
| Slayton Municipal (NSL) | Slayton | MN | Marshalltown Municipal to Slayton Municipal |
| Nevada Municipal (NVD) | Nevada | MO | Marshalltown Municipal to Nevada Municipal |
| L O Simenstad Municipal (OEO) | Osceola | WI | Marshalltown Municipal to L O Simenstad Municipal |
| Norfolk Regional/Karl Stefan Memorial Field (OFK) | Norfolk | NE | Marshalltown Municipal to Norfolk Regional/Karl Stefan Memorial Field |
| Johnson County Executive (OJC) | Olathe | KS | Marshalltown Municipal to Johnson County Executive |
| Kokomo Municipal (OKK) | Kokomo | IN | Marshalltown Municipal to Kokomo Municipal |
| Columbus Municipal (OLU) | Columbus | NE | Marshalltown Municipal to Columbus Municipal |
| Olney-Noble (OLY) | Olney-Noble | IL | Marshalltown Municipal to Olney-Noble |
| Eppley Airfield (OMA) | Omaha | NE | Marshalltown Municipal to Eppley Airfield |
| Winona Municipal-Max Conrad Field (ONA) | Winona | MN | Marshalltown Municipal to Winona Municipal-Max Conrad Field |
| The O'neill Municipal-John L Baker Field (ONL) | O'neill | NE | Marshalltown Municipal to The O'neill Municipal-John L Baker Field |
| Oskaloosa Municipal (OOA) | Oskaloosa | IA | Marshalltown Municipal to Oskaloosa Municipal |
| Chicago O'hare International (ORD) | Chicago | IL | Marshalltown Municipal to Chicago O'hare International |
| Grand Glaize Osage Beach (OSB) | Osage Beach | MO | Marshalltown Municipal to Grand Glaize Osage Beach |
| Wittman Regional (OSH) | Oshkosh | WI | Marshalltown Municipal to Wittman Regional |
| Worthington Municipal (OTG) | Worthington | MN | Marshalltown Municipal to Worthington Municipal |
| Ottumwa Regional (OTM) | Ottumwa | IA | Marshalltown Municipal to Ottumwa Regional |
| Owatonna Degner Regional (OWA) | Owatonna | MN | Marshalltown Municipal to Owatonna Degner Regional |
| Prairie Du Chien Municipal (PCD) | Prairie Duchien | WI | Marshalltown Municipal to Prairie Du Chien Municipal |
| Gen Wayne A Downing Peoria International (PIA) | Peoria | IL | Marshalltown Municipal to Gen Wayne A Downing Peoria International |
| Pierre Regional (PIR) | Pierre | SD | Marshalltown Municipal to Pierre Regional |
| Park Rapids Municipal-Konshok Field (PKD) | Park Rapids | MN | Marshalltown Municipal to Park Rapids Municipal-Konshok Field |
| Park Falls Municipal (PKF) | Park Falls | WI | Marshalltown Municipal to Park Falls Municipal |
| M. Graham Clark Downtown (PLK) | Point Lookout | MO | Marshalltown Municipal to M. Graham Clark Downtown |
| Plymouth Municipal (PLY) | Plymouth | IN | Marshalltown Municipal to Plymouth Municipal |
| Poplar Bluff Municipal (POF) | Poplar Bluff | MO | Marshalltown Municipal to Poplar Bluff Municipal |
| Pocahontas Municipal (POH) | Pocahontas | IA | Marshalltown Municipal to Pocahontas Municipal |
| Parsons/Tri-City (PPF) | Parsons | KS | Marshalltown Municipal to Parsons/Tri-City |
| Perry Municipal (PRO) | Perry | IA | Marshalltown Municipal to Perry Municipal |
| Prentice Municipal (PRW) | Prentice | WI | Marshalltown Municipal to Prentice Municipal |
| Atkinson Municipal (PTS) | Pittsburg | KS | Marshalltown Municipal to Atkinson Municipal |
| Chicago Executive (PWK) | Chicago | IL | Marshalltown Municipal to Chicago Executive |
| Batten International (RAC) | Racine | WI | Marshalltown Municipal to Batten International |
| Rooks County Regional (RCP) | Stockton | KS | Marshalltown Municipal to Rooks County Regional |
| Fulton County (RCR) | Rochester | IN | Marshalltown Municipal to Fulton County |
| Nartron Field (RCT) | Reed City | MI | Marshalltown Municipal to Nartron Field |
| Chicago/Rockford International (RFD) | Rockford | IL | Marshalltown Municipal to Chicago/Rockford International |
| Rhinelander Oneida County (RHI) | Rhinelander | WI | Marshalltown Municipal to Rhinelander Oneida County |
| Rice Lake Regional - Carl's Field (RIE) | Rice Lake | WI | Marshalltown Municipal to Rice Lake Regional - Carl's Field |
| Rolla Downtown (RLA) | Rolla | MO | Marshalltown Municipal to Rolla Downtown |
| New Richmond Regional (RNH) | New Richmond | WI | Marshalltown Municipal to New Richmond Regional |
| Jasper County (RNZ) | Rensselaer | IN | Marshalltown Municipal to Jasper County |
| Merrill Municipal (RRL) | Merrill | WI | Marshalltown Municipal to Merrill Municipal |
| Russell Municipal (RSL) | Russell | KS | Marshalltown Municipal to Russell Municipal |
| Rochester International (RST) | Rochester | MN | Marshalltown Municipal to Rochester International |
| Spirit Lake Municipal (RTL) | Spirit Lake | IA | Marshalltown Municipal to Spirit Lake Municipal |
| Redwood Falls Municipal (RWF) | Redwood Falls | MN | Marshalltown Municipal to Redwood Falls Municipal |
| Sparta Community - Hunter Field (SAR) | Sparta | IL | Marshalltown Municipal to Sparta Community - Hunter Field |
| Sheboygan County Memorial (SBM) | Sheboygan | WI | Marshalltown Municipal to Sheboygan County Memorial |
| South Bend International (SBN) | South Bend | IN | Marshalltown Municipal to South Bend International |
| Scribner State (SCB) | Scribner | NE | Marshalltown Municipal to Scribner State |
| Springfield/Branson National (SGF) | Springfield | MO | Marshalltown Municipal to Springfield/Branson National |
| Sikeston Memorial Municipal (SIK) | Sikeston | MO | Marshalltown Municipal to Sikeston Memorial Municipal |
| Sullivan County (SIV) | Sullivan | IN | Marshalltown Municipal to Sullivan County |
| Storm Lake Municipal (SLB) | Storm Lake | IA | Marshalltown Municipal to Storm Lake Municipal |
| Salina Regional (SLN) | Salina | KS | Marshalltown Municipal to Salina Regional |
| Salem-Leckrone (SLO) | Salem | IL | Marshalltown Municipal to Salem-Leckrone |
| Abraham Lincoln Capital (SPI) | Springfield | IL | Marshalltown Municipal to Abraham Lincoln Capital |
| Spencer Municipal/Northwest Iowa Regional (SPW) | Spencer | IA | Marshalltown Municipal to Spencer Municipal/Northwest Iowa Regional |
| Whiteside Co/Jos H Bittorf Field (SQI) | Sterling/Rock Falls | IL | Marshalltown Municipal to Whiteside Co/Jos H Bittorf Field |
| St Cloud Regional (STC) | St Cloud Regional | MN | Marshalltown Municipal to St Cloud Regional |
| Stevens Point Municipal (STE) | Stevens Point | WI | Marshalltown Municipal to Stevens Point Municipal |
| Rosecrans Memorial (STJ) | St Joseph | MO | Marshalltown Municipal to Rosecrans Memorial |
| Lambert St Louis International (STL) | St Louis | MO | Marshalltown Municipal to Lambert St Louis International |
| St Paul Downtown Holman Field (STP) | St Paul | MN | Marshalltown Municipal to St Paul Downtown Holman Field |
| Door County Cherryland (SUE) | Sturgeon Bay | WI | Marshalltown Municipal to Door County Cherryland |
| Spirit of St Louis (SUS) | St Louis | MO | Marshalltown Municipal to Spirit of St Louis |
| Richard I Bong Memorial (SUW) | Superior | WI | Marshalltown Municipal to Richard I Bong Memorial |
| Sioux Gateway/Col Bud Day Field (SUX) | Sioux City | IA | Marshalltown Municipal to Sioux Gateway/Col Bud Day Field |
| Waynesville St Robert Regional/Forney Field (TBN) | Fort Leonard Wood | MO | Marshalltown Municipal to Waynesville St Robert Regional/Forney Field |
| Philip Billard Municipal (TOP) | Topeka | KS | Marshalltown Municipal to Philip Billard Municipal |
| Trenton Municipal (TRX) | Trenton | MO | Marshalltown Municipal to Trenton Municipal |
| Britton Municipal (TTO) | Britton | SD | Marshalltown Municipal to Britton Municipal |
| Waukesha County (UES) | Waukesha | WI | Marshalltown Municipal to Waukesha County |
| Chicago/Waukegan Regional (UGN) | Chicago | IL | Marshalltown Municipal to Chicago/Waukegan Regional |
| Baldwin Field/Quincy Regional (UIN) | Quincy | IL | Marshalltown Municipal to Baldwin Field/Quincy Regional |
| Waukon Municipal Airport (UKN) | Waukon | IA | Marshalltown Municipal to Waukon Municipal Airport |
| New Ulm Municipal (ULM) | New Ulm | MN | Marshalltown Municipal to New Ulm Municipal |
| Dodge County (UNU) | Juneau | WI | Marshalltown Municipal to Dodge County |
| Rolla National (VIH) | Rolla/Vichy | MO | Marshalltown Municipal to Rolla National |
| Vandalia Municipal (VLA) | Vandalia | IL | Marshalltown Municipal to Vandalia Municipal |
| Porter County Regional (VPZ) | Valparaiso | IN | Marshalltown Municipal to Porter County Regional |
| Roy Otten Memorial Airfield (VRS) | Versailles | MO | Marshalltown Municipal to Roy Otten Memorial Airfield |
| Miller Field (VTN) | Valentine | NE | Marshalltown Municipal to Miller Field |
| Walter A Duncan Field/Illinois Valley Regional (VYS) | Peru | IL | Marshalltown Municipal to Walter A Duncan Field/Illinois Valley Regional |
| Harry Stern (WAH) | Wahpeton | ND | Marshalltown Municipal to Harry Stern |
| Roben-Hood (WBR) | Big Rapids | MI | Marshalltown Municipal to Roben-Hood |
| Baxter County (WMH) | Mountain Home | AR | Marshalltown Municipal to Baxter County |
| Grand Geneva Resort (XES) | Lake Geneva | WI | Marshalltown Municipal to Grand Geneva Resort |
| Madison Municipal (XMD) | Madison | SD | Marshalltown Municipal to Madison Municipal |
| Chan Gurney Municipal (YKN) | Yankton | SD | Marshalltown Municipal to Chan Gurney Municipal |
