| CAA | Catacamas Airport | Catacamas | HN |
| CAB | Cabinda Airport | Cabinda | AO |
| CAC | Cascavel Airport | Cascavel | BR |
| CAD | Cadillac Airport | Cadillac | US |
| CAE | Columbia Metropolitan Airport | Columbia | US |
| CAF | Carauari Airport | Carauari | BR |
| CAG | Elmas Airport | Cagliari | IT |
| CAH | Ca Mau Airport | Ca Mau | VN |
| CAI | Cairo International Airport | Cairo | EG |
| CAJ | Canaima Airport | Canaima | VE |
| CAK | Akron/Canton Regional Airport | Akron/Canton | US |
| CAL | Machrihanish Airport | Campbeltown | GB |
| CAM | Camiri Airport | Camiri | BO |
| CAN | Baiyun International Airport | Guangzhou | CN |
| CAO | Clayton Airport | Clayton | US |
| CAP | Cap Haitien Airport | Cap Haitien | HT |
| CAQ | Caucasia Airport | Caucasia | CO |
| CAR | Caribou Municipal Airport | Caribou | US |
| CAS | Anfa Airport | Casablanca | MA |
| CAT | Cat Island Airport | Cat Island | BS |
| CAU | Caruaru Airport | Caruaru | BR |
| CAV | Cazombo Airport | Cazombo | AO |
| CAW | Bartolomeu Lisandro Airport | Campos | BR |
| CAX | Carlisle Airport | Carlisle | GB |
| CAY | Rochambeau Airport | Cayenne | GF |
| CAZ | Cobar Airport | Cobar | AU |
| CBA | Corner Bay Airport | Corner Bay | US |
| CBB | J Wilsterman Airport | Cochabamba | BO |
| CBC | Cherrabun Airport | Cherrabun | AU |
| CBD | Air Force Base | Car Nicobar Island | IN |
| CBE | Wiley Ford Airport | Cumberland | US |
| CBF | Council Bluffs Municipal Airport | Council Bluffs | US |
| CBG | Cambridge Airport | Cambridge | GB |
| CBH | Leger Airport | Bechar | DZ |
| CBI | Cape Barren Island Airport | Cape Barren Island | AU |
| CBJ | Cabo Rojo Airport | Cabo Rojo | DO |
| CBK | Colby Municipal Airport | Colby | US |
| CBL | Ciudad Bolivar Airport | Ciudad Bolivar | VE |
| CBM | Columbus Air Force Base | Columbus | US |
| CBN | Cakrabhuwana Airport | Cirebon | ID |
| CBO | Awang Airport | Cotabato | PH |
| CBP | Coimbra Airport | Coimbra | PT |
| CBQ | Margaret Ekpo Intl Airport | Calabar | NG |
| CBR | Canberra Airport | Canberra | AU |
| CBS | Oro Negro Airport | Cabimas | VE |
| CBT | Catumbela Airport | Catumbela | AO |
| CBU | Drewitz | Cottbus | DE |
| CBV | Coban Airport | Coban | GT |
| CBW | Campo Mourao Airport | Campo Mourao | BR |
| CBX | Condobolin Airport | Condobolin | AU |
| CBY | Canobie Airport | Canobie | AU |
| CBZ | Cabin Creek Airport | Cabin Creek | US |
| CCA | Chaffee Air Force Base | Fort Chaffee | US |
| CCB | Cable Airport | Upland | US |
| CCC | Cayo Coco Airport | Cayo Coco | CU |
| CCD | Century City Airport | Los Angeles | US |
| CCE | Grand Case Airport | St Martin | MF |
| CCF | Salvaza Airport | Carcassonne | FR |
| CCG | Crane County Airport | Crane | US |
| CCH | Chile Chico Airport | Chile Chico | CL |
| CCI | Concordia Airport | Concordia | BR |
| CCJ | Kozhikode International Airport | Kozhikode | IN |
| CCK | Cocos Islands Airport | Cocos Islands | CC |
| CCL | Chinchilla Airport | Chinchilla | AU |
| CCM | Criciuma Airport | Criciuma | BR |
| CCN | Chaghcharan Airport | Chaghcharan | AF |
| CCO | Carimagua Airport | Carimagua | CO |
| CCP | Carriel Sur Airport | Concepcion | CL |
| CCQ | Cachoeira Airport | Cachoeira | BR |
| CCR | Buchanan Field | Concord | US |
| CCS | Simon Bolivar Airport | Caracas | VE |
| CCT | Colonia Catriel Airport | Colonia Catriel | AR |
| CCU | Subhas Chandra Bose Airport | Kolkata | IN |
| CCV | Craig Cove Airport | Craig Cove | VU |
| CCW | Cowell Airport | Cowell | AU |
| CCX | Caceres Airport | Caceres | BR |
| CCY | Charles City Municipal Airport | Charles City | US |
| CCZ | Chub Cay Airport | Chub Cay | BS |
| CDA | Cooinda Airport | Cooinda | AU |
| CDB | Cold Bay Airport | Cold Bay | US |
| CDC | Cedar City Airport | Cedar City | US |
| CDD | Cauquira Airport | Cauquira | HN |
| CDE | Caledonia Airport | Caledonia | PA |
| CDG | Charles De Gaulle Airport | Paris | FR |
| CDH | Harrell Field | Camden | US |
| CDI | Cachoeiro de Itapemirim Airport | Cachoeiro de Itapemirim | BR |
| CDJ | Conceicao Do Araguaia Airport | Conceicao Do Araguaia | BR |
| CDK | Lewis Airport | Cedar Key | US |
| CDL | Candle Airport | Candle | US |
| CDM | Fluvial Bus Station | Colonia del Sacramento | UY |
| CDN | Woodward Field | Camden | US |
| CDO | Cradock Airport | Cradock | ZA |
| CDP | Cuddapah Airport | Cuddapah | IN |
| CDQ | Croydon Airport | Croydon | AU |
| CDR | Chadron Airport | Chadron | US |
| CDS | Childress Airport | Childress | US |
| CDT | Castellon Airport | Castellon de la Plana | ES |
| CDU | Camden Airport | Camden | AU |
| CDV | Mudhole Smith Airport | Cordova | US |
| CDW | Caldwell Wright Airport | Caldwell | US |
| CDY | Cagayan De Sulu Airport | Mapun | PH |
| CDZ | Cadiz Railway Station | Cadiz | ES |
| CEA | Cessna Aircraft Field | Wichita | US |
| CEB | Mactan International Airport | Cebu | PH |
| CEC | Mc Namara Field | Crescent City | US |
| CED | Ceduna Airport | Ceduna | AU |
| CEE | Cherepovets Airport | Cherepovets | RU |
| CEF | Westover Metro Airport | Springfield | US |
| CEG | Hawarden Airport | Chester | GB |
| CEH | Chelinda Airport | Chelinda | MW |
| CEI | Mae Fah Luang International Airport | Chiang Rai | TH |
| CEJ | Railway Station | Cuenca | EC |
| CEK | Balandino Airport | Chelyabinsk | RU |
| CEL | Cape Eleuthera Airport | Cape Eleuthera | BS |
| CEM | Central Airport | Central | US |
| CEN | Ciudad Obregon Airport | Ciudad Obregon | MX |
| CEO | Waku-Kungo Airport | Waku-Kungo | AO |
| CEP | Concepcion Airport | Concepcion | BO |
| CEQ | Mandelieu Airport | Cannes | FR |
| CER | Maupertus Airport | Cherbourg | FR |
| CES | Cessnock Airport | Cessnock | AU |
| CET | Le Pontreau Airport | Cholet | FR |
| CEU | Oconee County Airport | Clemson | US |
| CEV | Mettle Field | Connersville | US |
| CEW | Bob Sikes Airport | Crestview | US |
| CEX | Chena Hot Springs Airport | Chena Hot Springs | US |
| CEY | Calloway County Airport | Murray | US |
| CEZ | Montezuma County Airport | Cortez | US |
| CFA | Coffee Point Airport | Coffee Point | US |
| CFB | Cabo Frio Airport | Cabo Frio | BR |
| CFC | Cacador Airport | Cacador | BR |
| CFD | Coulter Field | Bryan | US |
| CFE | Aulnat Airport | Clermont-Ferrand | FR |
| CFF | Cafunfo Airport | Cafunfo | AO |
| CFG | Cienfuegos Airport | Cienfuegos | CU |
| CFH | Clifton Hills Airport | Clifton Hills | AU |
| CFI | Camfield Station Airport | Camfield Station | AU |
| CFK | Abou Bakr Belkaid Airport | Chlef | DZ |
| CFN | Donegal Airport | Donegal | IE |
| CFO | Confreza Airport | Confreza | BR |
| CFP | Carpentaria Downs Airport | Carpentaria Downs | AU |
| CFQ | Creston Airport | Creston | CA |
| CFR | Carpiquet Airport | Caen | FR |
| CFS | Coffs Harbour Airport | Coffs Harbour | AU |
| CFT | Morenci Airport | Clifton | US |
| CFU | Ioannis Kapodistrias Airport | Kerkyra | GR |
| CFV | Coffeyville Municipal Airport | Coffeyville | US |
| CGA | Craig Sea Plane Base | Craig | US |
| CGB | M. Rondon Airport | Cuiaba | BR |
| CGC | Cape Gloucester Airport | Cape Gloucester | PG |
| CGD | Taohuayuan Airport | Changde | CN |
| CGE | Cambridge Airport | Cambridge | US |
| CGF | Cuyahoga County Airport | Cleveland | US |
| CGG | Casiguran Airport | Casiguran | PH |
| CGH | Congonhas Airport | Sao Paulo | BR |
| CGI | Cape Girardeau Airport | Cape Girardeau | US |
| CGJ | Kasompe Airport | Chingola | ZM |
| CGK | Soekarno-Hatta International Airport | Jakarta | ID |
| CGM | Mambajao Airport | Camiguin | PH |
| CGN | Cologne/Bonn Airport | Cologne/Bonn | DE |
| CGO | Xinzheng Intl Airport | Zhengzhou | CN |
| CGP | Shah Amanat Int'l Airport | Chittagong | BD |
| CGQ | Longjia International Airport | Changchun | CN |
| CGR | Campo Grande Internacional Airport | Campo Grande | BR |
| CGS | College Park Airport | College Park | US |
| CGT | Chinguetti Airport | Chinguetti | MR |
| CGU | Ciudad Guayana Airport | Ciudad Guayana | VE |
| CGV | Caiguna Airport | Caiguna | AU |
| CGX | Merrill C Meigs Field | Chicago | US |
| CGY | Laguindingan Int'l Airport | Cagayan de Oro | PH |
| CGZ | Casa Grande Municipal Airport | Casa Grande | US |
| CHA | Lovell Field | Chattanooga | US |
| CHB | Chilas Airport | Chilas | PK |
| CHC | Christchurch International Airport | Christchurch | NZ |
| CHE | City Hall Heliport | Tallinn | EE |
| CHF | Jinhae Airport | Jinhae | KR |
| CHG | Chaoyang Airport | Chaoyang | CN |
| CHH | Chachapoyas Airport | Chachapoyas | PE |
| CHI | Chicago FSS | Chicago | US |
| CHJ | Chipinge Airport | Chipinge | ZW |
| CHK | Chickasha Municipal Airport | Chickasha | US |
| CHL | Challis Airport | Challis | US |
| CHM | Chimbote Airport | Chimbote | PE |
| CHN | Jeonju Airport | Jeonju | KR |
| CHO | Albemarle Airport | Charlottesville | US |
| CHP | Circle Hot Springs Airport | Circle Hot Springs | US |
| CHQ | Ioannis Daskalogiannis Airport | Chania | GR |
| CHR | Chateauroux Airport | Chateauroux | FR |
| CHS | Charleston International Airport | Charleston | US |
| CHT | Tuuta Airport | Chatham Island | NZ |
| CHU | Chuathbaluk Airport | Chuathbaluk | US |
| CHV | Chaves Airport | Chaves | PT |
| CHX | Changuinola Airport | Changuinola | PA |
| CHY | Choiseul Bay Airport | Choiseul Bay | SB |
| CHZ | State Airport | Chiloquin | US |
| CIA | Ciampino Airport | Rome | IT |
| CIB | Ap In The Sky Airport | Catalina Island | US |
| CIC | Chico Airport | Chico | US |
| CID | Cedar Rapids Airport | Cedar Rapids | US |
| CIE | Collie Airport | Collie | AU |
| CIF | Yulong Airport | Chifeng | CN |
| CIG | Craig-Moffat Airport | Craig | US |
| CIH | Wangcun Airport | Changzhi | CN |
| CII | Cildir Airport | Aydin | TR |
| CIJ | E. Beltram Airport | Cobija | BO |
| CIK | Chalkyitsik Airport | Chalkyitsik | US |
| CIL | Melsing Creek Airport | Council | US |
| CIM | Cimitarra Airport | Cimitarra | CO |
| CIN | Carroll Airport | Carroll | US |
| CIO | MCAL Lopez Airport | Concepcion | PY |
| CIP | Chipata Airport | Chipata | ZM |
| CIQ | Chiquimula Airport | Chiquimula | GT |
| CIR | Cairo Airport | Cairo | US |
| CIS | Canton Island Airport | Canton Island | KI |
| CIT | Shymkent International Airport | Shymkent | KZ |
| CIU | Chippewa County Airport | Sault Ste. Marie | US |
| CIV | Chomley Airport | Chomley | US |
| CIW | Canouan Island Airport | Canouan Island | VC |
| CIX | Cornel Ruiz Airport | Chiclayo | PE |
| CIY | Vincent Magliocco Airport | Comiso | IT |
| CIZ | Coari Airport | Coari | BR |
| CJA | Cajamarca Airport | Cajamarca | PE |
| CJB | Peelamedu International Airport | Coimbatore | IN |
| CJC | El Loa Airport | Calama | CL |
| CJD | Candilejas Airport | Candilejas | CO |
| CJF | Coondewanna Airport | Coondewanna | AU |
| CJH | Chilko Lake Airport | Chilko Lake | CA |
| CJJ | Cheongju International Airport | Cheongju | KR |
| CJL | Chitral Airport | Chitral | PK |
| CJM | Chumphon Airport | Chumphon | TH |
| CJN | El Cajon Airport | El Cajon | US |
| CJS | Abraham Gonzalez International Airport | Ciudad Juarez | MX |
| CJT | Copalar Airport | Comitan | MX |
| CJU | Jeju International Airport | Jeju | KR |
| CKA | Kegelman Air Field | Cherokee | US |
| CKB | Benedum Airport | Clarksburg | US |
| CKC | Cherkasy International Airport | Cherkasy | UA |
| CKD | Crooked Creek Airport | Crooked Creek | US |
| CKE | Clear Lake Airport | Clear Lake | US |
| CKG | Jiangbei International Airport | Chongqing | CN |
| CKH | Chokurdakh Airport | Chokurdakh | RU |
| CKI | Croker Island Airport | Croker Island | AU |
| CKK | Cherokee Village Airport | Cherokee Village | US |
| CKL | Chkalovsky Airport | Chkalovsky | RU |
| CKM | Fletcher Field | Clarksdale | US |
| CKN | Crookston Municipal Airport | Crookston | US |
| CKO | Cornelio Procopio Airport | Cornelio Procopio | BR |
| CKR | Crane Island Airport | Crane Island | US |
| CKS | Carajas Airport | Carajas | BR |
| CKT | Sarakhs Airport | Sarakhs | IR |
| CKU | Cordova City Airport | Cordova | US |
| CKV | Outlaw Field | Clarksville | US |
| CKW | Christmas Creek Mine Airport | Christmas Creek Mine | AU |
| CKX | Chicken Airport | Chicken | US |
| CKY | Conakry International Airport | Conakry | GN |
| CKZ | Canakkale Airport | Canakkale | TR |
| CLA | Comilla Airport | Comilla | BD |
| CLC | Metroport Airport | Clear Lake City | US |
| CLD | McClellan-Palomar Airport | San Diego | US |
| CLE | Hopkins International Airport | Cleveland | US |
| CLF | Off-Line Point | Coltishall | GB |
| CLG | Coalinga Airport | Coalinga | US |
| CLH | Coolah Airport | Coolah | AU |
| CLI | Clintonville Airport | Clintonville | US |
| CLJ | Napoca Airport | Cluj | RO |
| CLK | Clinton Municipal Airport | Clinton | US |
| CLL | Easterwood Field | College Station | US |
| CLM | Fairchild International Airport | Port Angeles | US |
| CLN | Carolina Airport | Carolina | BR |
| CLO | Alfonso B. Aragon Airport | Cali | CO |
| CLP | Clarks Point Airport | Clarks Point | US |
| CLQ | Colima Airport | Colima | MX |
| CLR | Calipatria Airport | Calipatria | US |
| CLS | Centralia Airport | Chehalis | US |
| CLT | Douglas Airport | Charlotte | US |
| CLU | Columbus Municipal Airport | Columbus | US |
| CLV | Caldas Novas Airport | Caldas Novas | BR |
| CLW | Executive Airport | Clearwater | US |
| CLX | Clorinda Airport | Clorinda | AR |
| CLY | Sainte Catherine Airport | Calvi | FR |
| CLZ | Calabozo Airport | Calabozo | VE |
| CMA | Cunnamulla Airport | Cunnamulla | AU |
| CMB | Bandaranaike International Airport | Colombo | LK |
| CMC | Camocim Airport | Camocim | BR |
| CMD | Cootamundra Airport | Cootamundra | AU |
| CME | Ciudad Del Carmen Airport | Ciudad Del Carmen | MX |
| CMF | Chambery Airport | Chambery | FR |
| CMG | Corumba Internacional Airport | Corumba | BR |
| CMH | Port Columbus International Airport | Columbus | US |
| CMI | Willard University Airport | Champaign | US |
| CMJ | Qimei Airport | Qimei | TW |
| CMK | Club Makokola Airport | Club Makokola | MW |
| CML | Camooweal Airport | Camooweal | AU |
| CMM | Carmelita Airport | Carmelita | GT |
| CMN | Mohammed V Airport | Casablanca | MA |
| CMO | Obbia Airport | Obbia | SO |
| CMP | Campo Alegre Airport | Santana Do Araguaia | BR |
| CMQ | Clermont Airport | Clermont | AU |
| CMR | Colmar-Houssen Airport | Colmar | FR |
| CMS | Scusciuban Airport | Scusciuban | SO |
| CMT | Cameta Airport | Cameta | BR |
| CMU | Chimbu Airport | Kundiawa | PG |
| CMV | Coromandel Airport | Coromandel | NZ |
| CMW | Ign Agramonte International Airport | Camaguey | CU |
| CMX | Houghton County Airport | Hancock | US |
| CMY | Camp McCoy Army Air Field | Sparta | US |
| CMZ | Caia Airport | Caia | MZ |
| CNA | Cananea Airport | Cananea | MX |
| CNB | Coonamble Airport | Coonamble | AU |
| CNC | Coconut Island Airport | Coconut Island | AU |
| CND | Mihail Kogalniceanu Airport | Constanta | RO |
| CNE | Canon City Airport | Canon City | US |
| CNF | Tancredo Neves International Airport | Belo Horizonte | BR |
| CNG | Parvaud Airport | Cognac | FR |
| CNH | Claremont Municipal Airport | Claremont | US |
| CNI | Changhai Airport | Changhai | CN |
| CNJ | Cloncurry Airport | Cloncurry | AU |
| CNK | Blosser Municipal Airport | Concordia | US |
| CNL | Sindal Airport | Sindal | DK |
| CNM | Carlsbad Airport | Carlsbad | US |
| CNO | Chino Airport | Chino | US |
| CNP | Neerlerit Inaat Airport | Neerlerit Inaat | GL |
| CNQ | Camba Punta Airport | Corrientes | AR |
| CNR | Chanaral Airport | Chanaral | CL |
| CNS | Cairns International Airport | Cairns | AU |
| CNT | Charata Airport | Charata | AR |
| CNU | Martin Johnson Airport | Chanute | US |
| CNV | Canavieiras Airport | Canavieiras | BR |
| CNW | James Connall Airport | Waco | US |
| CNX | Chiang Mai International Airport | Chiang Mai | TH |
| CNY | Canyonlands Field | Moab | US |
| CNZ | Cangamba Airport | Cangamba | AO |
| COA | Columbia Airport | Columbia | US |
| COB | Coolibah Airport | Coolibah | AU |
| COC | Concordia Airport | Concordia | AR |
| COD | Yellowstone Regional Airport | Cody | US |
| COE | Coeur D'Alene Airport | Coeur D'Alene | US |
| COF | Patrick Air Force Base | Cocoa | US |
| COG | Mandinga Airport | Condoto | CO |
| COH | Cooch Behar Airport | Cooch Behar | IN |
| COI | Merritt Island Airport | Cocoa | US |
| COJ | Coonabarabran Airport | Coonabarabran | AU |
| COK | Kochi International Airport | Kochi | IN |
| COL | Coll Island Airport | Coll Island | GB |
| COM | Coleman Airport | Coleman | US |
| CON | Concord Airport | Concord | US |
| COO | Cadjehoun Airport | Cotonou | BJ |
| COP | Cooperstown Airport | Cooperstown | US |
| COQ | Choibalsan Airport | Choibalsan | MN |
| COR | Pajas Blancas Airport | Cordoba | AR |
| COS | Peterson Field | Colorado Springs | US |
| COT | Cotulla Airport | Cotulla | US |
| COU | Columbia Regional Airport | Columbia | US |
| COV | Covilha Airport | Covilha | PT |
| COW | Coquimbo Airport | Coquimbo | CL |
| COX | Congo Town Airport | Congo Town | BS |
| COY | Coolawanyah Station Airport | Coolawanyah Station | AU |
| COZ | Constanza Airport | Constanza | DO |
| CPA | Cape Palmas Airport | Harper | LR |
| CPB | Capurgana Airport | Capurgana | CO |
| CPC | Chapelco Airport | San Martin De Los Andes | AR |
| CPD | Coober Pedy Airport | Coober Pedy | AU |
| CPE | Campeche International Airport | Campeche | MX |
| CPF | Nglonram Airport | Cepu | ID |
| CPG | Carmen De Patagones Airport | Carmen De Patagones | AR |
| CPH | Kastrup Airport | Copenhagen | DK |
| CPI | Cape Orford Airport | Cape Orford | PG |
| CPJ | Railway Station | Castellon de la Plana | ES |
| CPL | Chaparral Airport | Chaparral | CO |
| CPM | Compton Airport | Compton | US |
| CPN | Cape Rodney Airport | Cape Rodney | PG |
| CPO | Desierto De Atacama Airport | Copiapo | CL |
| CPQ | Campinas International Airport | Campinas | BR |
| CPR | Casper Airport | Casper | US |
| CPS | Downtown Airport | St Louis | US |
| CPT | Cape Town International Airport | Cape Town | ZA |
| CPU | Cururupu Airport | Cururupu | BR |
| CPV | Joao Suassuna Airport | Campina Grande | BR |
| CPX | Culebra Airport | Culebra | PR |
| CPZ | Bus Station | Cipolletti | AR |
| CQA | Canarana Airport | Canarana | BR |
| CQD | Shahre Kord Airport | Shahre Kord | IR |
| CQF | Calais/Dunkerque Airport | Calais/Dunkerque | FR |
| CQM | Central Airport | Ciudad Real | ES |
| CQP | Cape Flattery Airport | Cape Flattery | AU |
| CQS | Costa Marques Airport | Costa Marques | BR |
| CQT | Caquetania Airport | Caquetania | CO |
| CRA | Craiova Airport | Craiova | RO |
| CRB | Collarenebri Airport | Collarenebri | AU |
| CRC | Cartago Airport | Cartago | CO |
| CRD | Comodoro Rivadavia Airport | Comodoro Rivadavia | AR |
| CRE | Grand Strand Airport | Myrtle Beach | US |
| CRF | Carnot Airport | Carnot | CF |
| CRG | Craig Municipal Airport | Jacksonville | US |
| CRH | Cherrabah Airport | Cherrabah | AU |
| CRI | Crooked Island Airport | Crooked Island | BS |
| CRJ | Coorabie Airport | Coorabie | AU |
| CRK | Clark International Airport | Angeles/Mabalacat | PH |
| CRL | Brussels S. Charleroi Airport | Brussels | BE |
| CRM | National Airport | Catarman | PH |
| CRO | Corcoran Airport | Corcoran | US |
| CRP | Corpus Christi International Airport | Corpus Christi | US |
| CRQ | Caravelas Airport | Caravelas | BR |
| CRR | Ceres Airport | Ceres | AR |
| CRS | Corsicana Airport | Corsicana | US |
| CRT | Crossett Municipal Airport | Crossett | US |
| CRU | Carriacou Island Airport | Carriacou Island | GD |
| CRV | Crotone Airport | Crotone | IT |
| CRW | Yeager Airport | Charleston | US |
| CRX | Roscoe Turner Airport | Corinth | US |
| CRY | Carlton Hill Airport | Carlton Hill | AU |
| CRZ | Turkmenabat Airport | Turkmenabat | TM |
| CSA | Colonsay Airport | Colonsay | GB |
| CSB | Caransebes Airport | Caransebes | RO |
| CSC | Canas Airport | Canas | CR |
| CSD | Cresswell Downs Airport | Cresswell Downs | AU |
| CSE | Crested Butte Airport | Crested Butte | US |
| CSF | Creil Airport | Creil | FR |
| CSG | Metropolitan Area | Columbus | US |
| CSH | Solovki Airport | Solovetsky | RU |
| CSI | Casino Airport | Casino | AU |
| CSK | Cap Skiring Airport | Cap Skiring | SN |
| CSL | O'Sullivan Army Air Field | San Luis Obispo | US |
| CSM | Sherman Airport | Clinton | US |
| CSN | Carson City Airport | Carson City | US |
| CSO | Cochstedt Airport | Magdeburg | DE |
| CSQ | Creston Municipal Airport | Creston | US |
| CSR | Casuarito Airport | Casuarito | CO |
| CSS | Cassilandia Airport | Cassilandia | BR |
| CST | SPB | Castaway Island | FJ |
| CSU | Santa Cruz Do Sul Airport | Santa Cruz Do Sul | BR |
| CSV | Crossville Memorial Airport | Crossville | US |
| CSW | Colorado do Oeste Airport | Colorado do Oeste | BR |
| CSX | Huanghua International Airport | Changsha | CN |
| CSY | Cheboksary Airport | Cheboksary | RU |
| CSZ | Brigadier Hector Ruiz | Coronel Suarez | AR |
| CTA | Fontanarossa Airport | Catania | IT |
| CTB | Cut Bank Airport | Cut Bank | US |
| CTC | Catamarca Airport | Catamarca | AR |
| CTD | Chitre Airport | Chitre | PA |
| CTE | Carti Airport | Carti | PA |
| CTF | Coatepeque Airport | Coatepeque | GT |
| CTG | Rafael Nunez Airport | Cartagena | CO |
| CTH | Chestercounty Carlson Airport | Coatesville | US |
| CTI | Cuito Cuanavale Airport | Cuito Cuanavale | AO |
| CTJ | Railway Station | Caserta | IT |
| CTK | Canton Airport | Canton | US |
| CTL | Charleville Airport | Charleville | AU |
| CTM | Chetumal Airport | Chetumal | MX |
| CTN | Cooktown Airport | Cooktown | AU |
| CTO | Peconic River Airport | Calverton | US |
| CTP | Carutapera Airport | Carutapera | BR |
| CTQ | Do Palmar Airport | Santa Vitoria | BR |
| CTR | Cattle Creek Airport | Cattle Creek | AU |
| CTS | New Chitose Airport | Sapporo | JP |
| CTT | Le Castellet Airport | Le Castellet | FR |
| CTU | Shuangliu International | Chengdu | CN |
| CTW | Cottonwood Airport | Cottonwood | US |
| CTX | Cortland Airport | Cortland | US |
| CTY | Cross City Airport | Cross City | US |
| CTZ | Sampson County Airport | Clinton | US |
| CUA | Ciudad Constitucion Airport | Ciudad Constitucion | MX |
| CUB | Owens Field | Columbia | US |
| CUC | Camilo Dazo Airport | Cucuta | CO |
| CUD | Caloundra Airport | Caloundra | AU |
| CUE | Cuenca Airport | Cuenca | EC |
| CUF | Levaldigi Airport | Cuneo | IT |
| CUG | Cudal Airport | Cudal | AU |
| CUH | Cushing Municipal Airport | Cushing | US |
| CUI | Currillo Airport | Currillo | CO |
| CUJ | Culion Airport | Culion | PH |
| CUK | Caye Caulker Airport | Caye Caulker | BZ |
| CUL | Fedl De Bachigualato Airport | Culiacan | MX |
| CUM | Cumana Airport | Cumana | VE |
| CUN | Cancun Airport | Cancun | MX |
| CUO | Caruru Airport | Caruru | CO |
| CUP | Carupano Airport | Carupano | VE |
| CUQ | Coen Airport | Coen | AU |
| CUR | Aeropuerto Hato | Curacao | CW |
| CUS | Columbus Municipal Airport | Columbus | US |
| CUT | Cutral Airport | Cutral | AR |
| CUU | Gen Fierro Villalobos Airport | Chihuahua | MX |
| CUV | Casigua Airport | Casigua | VE |
| CUW | Cube Cove Airport | Cube Cove | US |
| CUX | Cuddihy Field | Corpus Christi | US |
| CUY | Cue Airport | Cue | AU |
| CUZ | Velazco Astete Airport | Cuzco | PE |
| CVA | Civic Ar Heliport | Pittsburgh | US |
| CVB | Chungrebu Airport | Chungrebu | PG |
| CVC | Cleve Airport | Cleve | AU |
| CVE | Covenas Airport | Covenas | CO |
| CVF | Courchevel Airport | Courchevel | FR |
| CVG | Cincinnati/Northern Kentucky Airport | Cincinnati | US |
| CVH | Caviahue Airport | Caviahue | AR |
| CVI | Caleta Olivia Airport | Caleta Olivia | AR |
| CVJ | Cuernavaca Airport | Cuernavaca | MX |
| CVL | Cape Vogel Airport | Cape Vogel | PG |
| CVM | Ciudad Victoria Airport | Ciudad Victoria | MX |
| CVN | Clovis Municipal Airport | Clovis | US |
| CVO | Albany Airport | Albany | US |
| CVQ | Carnarvon Airport | Carnarvon | AU |
| CVR | Hughes Airport | Culver City | US |
| CVS | Cannon Air Force Base | Clovis | US |
| CVT | Coventry Airport | Coventry | GB |
| CVU | Corvo Island (Azores) Airport | Corvo Island (Azores) | PT |
| CWA | Central Wisconsin Airport | Wausau | US |
| CWB | Afonso Pena Airport | Curitiba | BR |
| CWC | Chernivtsi International Airport | Chernivtsi | UA |
| CWF | Chennault International Airport | Lake Charles | US |
| CWG | Callaway Gardens Airport | Callaway Gardens | US |
| CWI | Clinton Airport | Clinton | US |
| CWL | Cardiff Airport | Cardiff | GB |
| CWO | Ft. Wolter Air Force Base | Mineral Wells | US |
| CWR | Cowarie Airport | Cowarie | AU |
| CWS | Center Island Airport | Center Island | US |
| CWT | Cowra Airport | Cowra | AU |
| CWW | Corowa Airport | Corowa | AU |
| CWX | Cochise County Airport | Willcox | US |
| CXA | Caicara De Oro Airport | Caicara De Oro | VE |
| CXB | Coxs Bazar Airport | Coxs Bazar | BD |
| CXC | Chitina Airport | Chitina | US |
| CXF | Coldfoot Airport | Coldfoot | US |
| CXH | Coal Harbour Sea Plane Base | Vancouver | CA |
| CXI | Cassidy International Airport | Kiritimati | KI |
| CXJ | Campo Dos Bugres Airport | Caxias Do Sul | BR |
| CXL | Calexico International Airport | Calexico | US |
| CXN | Candala Airport | Candala | SO |
| CXO | Montgomery County Airport | Conroe | US |
| CXP | Tunggul Wulung Airport | Cilacap | ID |
| CXQ | Christmas Creek Station Airport | Christmas Creek Station | AU |
| CXR | Cam Rahn International Airport | Nha Trang | VN |
| CXT | Charters Towers Airport | Charters Towers | AU |
| CXY | Cat Cays Airport | Cat Cays | BS |
| CYA | Les Cayes Airport | Les Cayes | HT |
| CYB | Gerrard-Smith Airport | Cayman Brac Island | KY |
| CYC | Caye Chapel Airport | Caye Chapel | BZ |
| CYE | Crystal Lake Airport | Crystal Lake | US |
| CYF | Chefornak Sea Plane Base | Chefornak | US |
| CYG | Corryong Airport | Corryong | AU |
| CYI | Chiayi Airport | Chiayi | TW |
| CYL | Coyoles Airport | Coyoles | HN |
| CYM | Chatham Sea Plane Base | Chatham | US |
| CYO | Cayo Largo Del Sur Airport | Cayo Largo Del Sur | CU |
| CYP | Calbayog Airport | Calbayog | PH |
| CYR | Laguna de los Patos Airport | Colonia del Sacramento | UY |
| CYS | Cheyenne Airport | Cheyenne | US |
| CYT | Yakataga Intermediate Airport | Yakataga | US |
| CYU | Cuyo Airport | Cuyo | PH |
| CYW | Celaya Airport | Ciudad de Celaya | MX |
| CYX | Chersky Airport | Chersky | RU |
| CYZ | Cauayan Airport | Cauayan | PH |
| CZA | Chichen Itza Airport | Chichen Itza | MX |
| CZB | Carlos Ruhl Airport | Cruz Alta | BR |
| CZC | Copper Centre Airport | Copper Centre | US |
| CZE | Coro Airport | Coro | VE |
| CZF | Cape Romanzof Airport | Cape Romanzof | US |
| CZH | Corozal Airport | Corozal | BZ |
| CZJ | Corazon De Jesus Airport | Corazon De Jesus | PA |
| CZK | Cascade Locks/Stevens Airport | Cascade Locks | US |
| CZL | Ain El Bey Airport | Constantine | DZ |
| CZM | Cozumel Airport | Cozumel | MX |
| CZN | Chisana Field | Chisana | US |
| CZO | Chistochina Airport | Chistochina | US |
| CZP | Cape Pole Airport | Cape Pole | US |
| CZS | Campo Internacional Airport | Cruzeiro Do Sul | BR |
| CZT | Carrizo Springs Airport | Carrizo Springs | US |
| CZU | Corozal Airport | Corozal | CO |
| CZW | Czestochowa Airport | Czestochowa | PL |
| CZX | Benniu Airport | Changzhou | CN |
| CZY | Cluny Airport | Cluny | AU |
| CZZ | Campo Airport | Campo | US |