| 7901 | CIV | Civil Aviation Authority of New Zealand | | | ICAO1 |
| 7902 | CIVC | CIVIC CENTER TOWING INC | | | SCAC3 |
| 7903 | CIVD | COMPASS INDUSTRIAL SERVICES LTD | | | SCAC4 |
| 7904 | CIVE | CHARITON VET | | | SCAC4 |
| 7905 | CIVI | CINEVATE INC | | | SCAC4 |
| 7906 | CIVL | CIMARRON TRUCK LINES | | | SCAC3 |
| 7907 | CIVL | CIMARRON | | | SCAC4 |
| 7908 | CIVN | CARI-O-VAN INC | | | SCAC3 |
| 7909 | CIVR | CONTINETAL TOURS | | | SCAC3 |
| 7910 | CIVT | CIRCLE V TRANSPORTATION INC | | | SCAC3 |
| 7911 | CIVX | Cargill, Inc., Vegetable Oil Division | 10/1966 | | NAKINA |
| 7912 | CIVX | Cargill, Inc. | added 1/1962; 7/1965-4/1970; eliminated 7/1970 | | NAKINA |
| 7913 | CIVX | Cargill, Inc. | added 1/62; 7/65-4/70; eliminated 7/70 | | NRHS |
| 7914 | CIVX | Cargill, Inc., Vegetable Oil Division | Oct-66 | | NRHS |
| 7915 | CIVX | CARGILL, INC, VEGETABLE OIL DIV. | | | PWRC |
| 7916 | CIVX | CARGILL INC VEG OIL DIV | | | SCAC3 |
| 7917 | CIW | Civair Airways | Callsign: Civflight, | ZA | AVCODES |
| 7918 | CIW | Afrik Airways | | CI | AVCODES |
| 7919 | CIW | Civair Airways | | | ICAO1 |
| 7920 | CIW | Illinois Central R.R. Co. | added 4/1988; 1/1994-7/2005 | | NAKINA |
| 7921 | CIW | Illinois Central Gulf R.R. Co. | added 7/1983; eliminated 4/1988 | | NAKINA |
| 7922 | CIW | Chicago & Illinois Western R.R. | 1/1941-10/1966 & 1/1975-1/1980; eliminated 1/1981 | | NAKINA |
| 7923 | CIW | Chicago & Illinois Western R.R. Co. | added 1/1981; eliminated 7/1983 | | NAKINA |
| 7924 | CIW | Chicago & Illinois Western R.R. | 10/57-10/66 & 1/75-1/80; eliminated 1/81 | | NRHS |
| 7925 | CIW | Chicago & Illinois Western R.R. Co. | added 1/81 | | NRHS |
| 7926 | CIW | Illinois Central Gulf R.R. Co. | eliminated 4/88 | | NRHS |
| 7927 | CIW | Illinois Central R.R. Co. | added 4/88; 1/94-7/2000 | | NRHS |
| 7928 | CIW | ILLINOIS CENTRAL RAILROAD [CHICAGO & ILLINOIS WESTERN RR] | | | PWRC |
| 7929 | CIW | Illinois Central Gulf (Canadian National Railway) | | | RSRV |
| 7930 | CIW | Chicago & Illinois Western | | USA | TRAFFIC |
| 7931 | CIWE | CAM II WAREHOUSE | | | SCAC4 |
| 7932 | CIWH | CRESCENT CITY TRANSPORTATION & WARE | | | SCAC4 |
| 7933 | CIWI | COLLINS INDUSTRIAL WAREHOUSE | | | SCAC3 |
| 7934 | CIWL | Compagnie International de Wagon Lits | | X | TRAFFIC |
| 7935 | CIWL | Compagnie des Wagon-Lits | | BE | VKM |
| 7936 | CIWN | The Cincinnati, Indianapolis & Western R.R. Co. | 8/1920-7/1923 | | NAKINA |
| 7937 | CIWN | The Cincinnati, Indianapolis & Western R.R. Co. | 23-Jul | | NRHS |
| 7938 | CIWN | CINCINNATI, INDIANAPOLIS & WESTERN RAILROAD CO. | | | PWRC |
| 7939 | CIWQ | CAIN WAREHOUSE CO | | | SCAC3 |
| 7940 | CIWR | CIRCLE W TRUCKING INC | | | SCAC4 |
| 7941 | CIX | City Connexion Airlines | IATA: G3, Callsign: Connexion, | RU | AVCODES |
| 7942 | CIX | City Connexion Airlines | IATA: G3 | | ICAO1 |
| 7943 | CIX | Oxford Paper Co., Inc. | added 10/1958; eliminated 1/1959 | | NAKINA |
| 7944 | CIX | Champion-International Co. | added 4/1956; 10/1957; eliminated 10/1958 | | NAKINA |
| 7945 | CIX | Champion-International Co. | 10/57; eliminated 10/58 | | NRHS |
| 7946 | CIX | Oxford Paper Co., Inc. | added 10/58; eliminated 1/59 | | NRHS |
| 7947 | CIX | OXFORD PAPER CO. INC. [CHAMPION-INTERNATIONAL CO.] | | | PWRC |
| 7948 | CIXA | CASTILLO TRANSPORT | | | SCAC4 |
| 7949 | CIXD | CIARA EXPEDITING INC | | | SCAC3 |
| 7950 | CIXF | CRITEX | | | SCAC4 |
| 7951 | CIXI | COLUMBUS INDIANA EXPRESS INC | | | SCAC3 |
| 7952 | CIXI | COLUMBUS INDIANA EXPRESS INC | | | SCAC4 |
| 7953 | CIXL | CON-LEI TRANSPORT LLC | | | SCAC4 |
| 7954 | CIXN | COLTRANSPORT INC | | | SCAC4 |
| 7955 | CIXO | CI TRANSPORTATION | | | SCAC4 |
| 7956 | CIXS | CIRCLE EXPRESS-ALTON (DIV OF ECK MI | | | SCAC3 |
| 7957 | CIXT | CRISS INDUSTRIES | | | SCAC4 |
| 7958 | CIXX | Calciner Industries, Inc. | 1/1994-7/2005 (not listed) | | NAKINA |
| 7959 | CIXX | Calciner Industries, Inc. | 1/94-7/2000 | | NRHS |
| 7960 | CIXX | CALCINER INDUSTRIES, INC. | | | PWRC |
| 7961 | CIXX | Calciner Industries | | | RSRV |
| 7962 | CIXX | CALCINER INDUSTRIES, INC. | | | SCAC4 |
| 7963 | CIYC | CITY CARTAGE SYSTEM | | | SCAC3 |
| 7964 | CIYE | CITY FUEL CORP | | | SCAC4 |
| 7965 | CIYF | CITY FIBERS INC | | | SCAC3 |
| 7966 | CIYF | CITY FIBERS INC | | | SCAC4 |
| 7967 | CIYG | CITY MART ENERGY LLC | | | SCAC4 |
| 7968 | CIYH | CITY HAUL, INC | | | SCAC3 |
| 7969 | CIYH | CITY HAUL INC | | | SCAC4 |
| 7970 | CIYL | CITY LIMIT MOTOR SERVICE | | | SCAC3 |
| 7971 | CIYM | CITY MARKET, INC | | | SCAC3 |
| 7972 | CIYP | CITY OF PITTSBURGH, DEPT OF SUPPLIE | | | SCAC3 |
| 7973 | CIYQ | CITY DELIVERY INC | | | SCAC3 |
| 7974 | CIYQ | CITY DELIVERY INC | | | SCAC4 |
| 7975 | CIYS | CITY SERVICE | | | SCAC4 |
| 7976 | CIYT | CITY TRUCKING | | | SCAC3 |
| 7977 | CIZ | CHAMPION INTERNATIONAL | | | PWRC |
| 7978 | CIZN | CITIZEN & SONS TRUCKING | | | SCAC3 |
| 7979 | CIZO | CARLO IZO SHIPPING COMPANY LIMITED | | | SCAC3 |
| 7980 | CIZR | CISZAR TRUCKING COMPANY | | | SCAC3 |
| 7981 | CIZR | CISZAR TRUCKING COMPANY | | | SCAC4 |
| 7982 | CJ | China Northern Airlines | ICAO: CBF, Callsign: China Northern, IATA Prefix: 782, Designator CJ recalled by IATA. Formerly CAAC Shenyang region | PRC | AVCODES |
| 7983 | CJ | Caribbean Air Transport Co. Inc. | Callsign: Caribbean, | NA | AVCODES |
| 7984 | CJ | Caribbean Air Transport | ICAO: CLT, Callsign: Caribbean, | NA | AVCODES |
| 7985 | CJ | Cityflyer Express Limited t/a BA Cityflyer | ICAO: CFE, Callsign: Flyer, Designator CJ* reinstated by IATA | GB | AVCODES |
| 7986 | CJ | Chemins de Fer du Jura | | CH | TRAFFIC |
| 7987 | CJ | Compagnie des chemins de fer du Jura | | CH | VKM |
| 7988 | CJA | CanJet Airlines | IATA: C6, Callsign: Canjet, Founded in 1999 and commenced operations on 05 September 2000. Wholly owned by IMP Group International. Merged into Canada 3000 24 April 2001. | CDN | AVCODES |
| 7989 | CJA | CanJet Airlines | IATA: C6, Callsign: Canjet, Relaunched on 20 June 2002. Suspeneded all operations on 01 September 2015. Wholly owned by IMP Group International. | CDN | AVCODES |
| 7990 | CJA | CanJet | IATA: C6 | | ICAO1 |
| 7991 | CJA | CanJet | Real: CJA, C6 | CDN | TRAFFIC |
| 7992 | CJAA | CJ TRUCKING SERVICE LLC | | | SCAC4 |
| 7993 | CJAB | C J AUTO BODY | | | SCAC3 |
| 7994 | CJAB | C J BAR TRUCKING | | | SCAC4 |
| 7995 | CJAC | CARJAC ENTERPRISES | | | SCAC3 |
| 7996 | CJAD | CUELLAR, JOSE ALONZO DE LA GARZA | | | SCAC4 |
| 7997 | CJAH | CAPTAIN JIMS ANTIQUE & CLASSIC BOAT | | | SCAC4 |
| 7998 | CJAM | CHARLES, JAMES TRUCKING CO | | | SCAC3 |
| 7999 | CJAM | C J TRUCKING/HOT FREIGHT EXPRESS | | | SCAC4 |
| 8000 | CJAN | CAPE JANE | | | SCAC4 |
