| CGI | KCGI | Cape Girardeau Regional Airport | Cape Girardeau | |
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| LUR | PALU | Cape Lisburne LRRS Airport | Cape Lisburne | |
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| WWD | KWWD | Cape May County Airport | Wildwood | |
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| EHM | PAEH | Cape Newenham LRRS Airport | Cape Newenham | |
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| CZF | PACZ | Cape Romanzof LRRS Airport | Cape Romanzof | |
|
| LAN | KLAN | Capital City Airport | Lansing | |
|
| CAR | KCAR | Caribou Municipal Airport | Caribou | |
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| MER | KMER | Castle Airport | - | |
|
| CNM | KCNM | Cavern City Air Terminal | Carlsbad | |
|
| CDC | KCDC | Cedar City Regional Airport | Cedar City | |
|
| APA | KAPA | Centennial Airport | - | |
|
| GRI | KGRI | Central Nebraska Regional Airport | Grand Island | |
|
| CWA | KCWA | Central Wisconsin Airport | - | |
|
| CDR | KCDR | Chadron Municipal Airport | Chadron | |
|
| YKN | KYKN | Chan Gurney Municipal Airport | Yankton | |
|
| AXN | KAXN | Chandler Field | Alexandria | |
|
| CNU | KCNU | Chanute Martin Johnson Airport | Chanute | |
|
| MKC | KMKC | Charles B. Wheeler Downtown Airport | Kansas City | |
|
| STS | KSTS | Charles M. Schulz Sonoma County Airport | Santa Rosa | |
|
| CHO | KCHO | Charlottesville Albemarle Airport | Charlottesville | |
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| JHW | KJHW | Chautauqua County-Jamestown Airport | Jamestown | |
|
| TVC | KTVC | Cherry Capital Airport | Traverse City | |
|
| CYS | KCYS | Cheyenne Regional Jerry Olson Field | Cheyenne | |
|
| PWK | KPWK | Chicago Executive Airport | - | |
|
| CDS | KCDS | Childress Municipal Airport | Childress | |
|
| CIU | KCIU | Chippewa County International Airport | - | |
|
| EAU | KEAU | Chippewa Valley Regional Airport | Eau Claire | |
|
| LUK | KLUK | Cincinnati Municipal Airport Lunken Field | - | |
|
| EWN | KEWN | Coastal Carolina Regional Airport | New Bern | |
|
| COE | KCOE | Coeur D'Alene - Pappy Boyington Field | Coeur D'Alene | |
|
| CDB | PACD | Cold Bay Airport | Cold Bay | |
|
| DET | KDET | Coleman A. Young Municipal Airport | - | |
|
| COU | KCOU | Columbia Regional Airport | Columbia | |
|
| CSG | KCSG | Columbus Metropolitan Airport | Columbus | |
|
| CLU | KBAK | Columbus Municipal Airport | Columbus | |
|
| CON | KCON | Concord Municipal Airport | Concord | |
|
| CVO | KCVO | Corvallis Municipal Airport | Albany | |
|
| CWT | YCWR | Cowra Airport | - | |
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| PRX | KPRX | Cox Field | Paris | |
|
| CSV | KCSV | Crossville Memorial Whitson Field | Crossville | |
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| BBD | KBBD | Curtis Field | Brady | |
|
| CTB | KCTB | Cut Bank International Airport | Cut Bank | |
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| CGF | KCGF | Cuyahoga County Airport | - | |
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| DHT | KDHT | Dalhart Municipal Airport | Dalhart | |
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| DNL | KDNL | Daniel Field | - | |
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| DAN | KDAN | Danville Regional Airport | Danville | |
|
| DMA | KDMA | Davis Monthan Air Force Base | - | |
|
| DAA | KDAA | Davison Army Air Field | Fort Belvoir | |
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| GDV | KGDV | Dawson Community Airport | Glendive | |
|
| SCC | PASC | Deadhorse Airport | Prudhoe Bay/Deadhorse | |
|