| 8901 | CLED | CLEVELAND CARTAGE CO THE | | | SCAC3 |
| 8902 | CLED | COUNTY LINE EXPRESS INC (DEDICATED | | | SCAC4 |
| 8903 | CLEF | CLASSIC CARGO INC (AIR FREIGHT FORW | | | SCAC4 |
| 8904 | CLEF | Tramway de Clermont-Ferrand | Real: SMTC | F | TRAFFIC |
| 8905 | CLEG | CLEVELAND SYRUP CORPORATION | | | SCAC3 |
| 8906 | CLEI | CLEVELAND ELECTRIC ILLUMINATING CO. | | | PWRC |
| 8907 | CLEI | CAL LEASING | | | SCAC3 |
| 8908 | CLEI | CHS FUEL CO LLC | | | SCAC4 |
| 8909 | CLEJ | CLEMENTS TRUCKING CO | | | SCAC3 |
| 8910 | CLEK | COLLIE EQUIPMENT AND MANUFACTURING | | | SCAC3 |
| 8911 | CLEL | COLEMAN EDUCATIONAL TRUST | | | SCAC3 |
| 8912 | CLEM | CLEMANS TRUCK LINE INC | | | PWRC |
| 8913 | CLEM | CLEMENTS TRUCKING | | | SCAC3 |
| 8914 | CLEM | COLT EXPRESS | | | SCAC4 |
| 8915 | CLEN | CLE-MAR CARTAGE INC | | | SCAC3 |
| 8916 | CLEN | CHALLENGER FREIGHT SYSTEMS | | | SCAC4 |
| 8917 | CLEO | COLONIE TRUCK LEASING | | | SCAC3 |
| 8918 | CLEQ | CLEMENTS CONSTRUCTION COMPANY INC | | | SCAC3 |
| 8919 | CLEQ | COLT LOGISTICS INC | | | SCAC4 |
| 8920 | CLER | CLEMENS, R F & SONS INC | | | SCAC3 |
| 8921 | CLER | CLEMENS, R F & SONS INC | | | SCAC4 |
| 8922 | CLES | COLE TRANSPORT CORP | | | SCAC3 |
| 8923 | CLET | CLETEX TRUCKING, INC | | | SCAC3 |
| 8924 | CLET | Československé letectvo | | CS | TRAFFIC |
| 8925 | CLEU | CLEAN HARBORS ENVIRONMENTAL SERVICES, INC | | USA | BIC |
| 8926 | CLEU | EUROPORT SP. Z.O.O. | | PL | VKM |
| 8927 | CLEV | CLEVELANDS TRUCK LINES, INC | | | SCAC3 |
| 8928 | CLEV | CLEVELAND, KEVIN L | | | SCAC4 |
| 8929 | CLEW | CLEARWATER TRUCKING INC | | | SCAC3 |
| 8930 | CLEX | Cleco Corp. | 7/2000-7/2005 | | NAKINA |
| 8931 | CLEX | Chemical Enterprises, Inc. | added 1/1984; eliminated 4/1990 | | NAKINA |
| 8932 | CLEX | Cleco Corp. | Jul-00 | | NRHS |
| 8933 | CLEX | Chemical Enterprises, Inc. | eliminated 4/90 | | NRHS |
| 8934 | CLEX | *CHEMICAL ENTERPRISES INC. | | | PWRC |
| 8935 | CLEX | +CLECO CORPORATION | | | PWRC |
| 8936 | CLEX | Chemical Enterprises (Cieco Corporation) | | | RSRV |
| 8937 | CLEX | CLECO CORPORATION | | | SCAC4 |
| 8938 | CLEY | CONLEY MOTOR FREIGHT INC | | | SCAC3 |
| 8939 | CLF | Bristol Flying Centre Limited | Callsign: Clifton, Name changed to Centreline AV Limited. | GB | AVCODES |
| 8940 | CLF | Centreline AV Limited | Callsign: Clifton, Name changed Bristol Flying Centre Limited. | GB | AVCODES |
| 8941 | CLF | Bristol Flying Centre | | | ICAO1 |
| 8942 | CLF | Cooperativa Linee Ferroviari | | I | TRAFFIC |
| 8943 | CLF | Costruzioni Linee Ferroviarie S.p.A. | | IT | VKM |
| 8944 | CLFA | CLIFTON TRANSFER AND CARTAGE INC | | | SCAC3 |
| 8945 | CLFB | CONSOLIDATED FIBRES INC | | | SCAC3 |
| 8946 | CLFB | CROSSROADS TRAILER RENTALS INC | | | SCAC4 |
| 8947 | CLFC | CLIFF INDUSTRIES INC | | | SCAC3 |
| 8948 | CLFD | CAR-LAW FREIGHT SYSTEMS | | | SCAC3 |
| 8949 | CLFD | CENTRAL FEEDS INC | | | SCAC4 |
| 8950 | CLFE | CALIFORNIA REFRIGERATED EXPRESS | | | SCAC3 |
| 8951 | CLFF | COLLIS, FRED F & SONS INC | | | SCAC4 |
| 8952 | CLFH | CALIFORNIA FREIGHT TRANSPORT | | | SCAC3 |
| 8953 | CLFI | CALIFORNIA TRANSFER AND STORAGE INC | | | SCAC3 |
| 8954 | CLFK | CLIFTON, JOE TRUCKING LLC | | | SCAC4 |
| 8955 | CLFM | CLIFTON MOVERS | | | SCAC3 |
| 8956 | CLFN | CLIFFORD, BERT TRANSPORT INC | | | SCAC3 |
| 8957 | CLFO | CALIFORNIA MOVERS EXPRESS INC | | | SCAC3 |
| 8958 | CLFP | CLIFFS TRANSPORTATION | | | SCAC3 |
| 8959 | CLFQ | CLIFS CARTAGE INC | | | SCAC3 |
| 8960 | CLFQ | CHEMAS TRUCKING LLC | | | SCAC4 |
| 8961 | CLFR | C L MOTOR FREIGHT INC | | | SCAC3 |
| 8962 | CLFR | CLARK FREIGHTWAYS | | | SCAC4 |
| 8963 | CLFT | CLIFTON TRUCKING | | | SCAC4 |
| 8964 | CLFU | CARGO LINK INTERNATIONAL PTE LTD | | | SCAC4 |
| 8965 | CLFV | CLIFFS VAN & STORAGE | | | SCAC3 |
| 8966 | CLFW | CLIFFORD, W INC | | | SCAC4 |
| 8967 | CLFY | CLASS FREIGHT LINES | | | SCAC3 |
| 8968 | CLG | Chalair | Callsign: Challair, Name changed to Chalair Aviation. Designator M6* recalled by IATA | F | AVCODES |
| 8969 | CLG | Chalair | IATA: M6, Callsign: Challair, Designator M6* recalled by IATA | F | AVCODES |
| 8970 | CLG | Chalair Aviation | IATA: CE, Callsign: Challair, Name changed from Chalair. Designator M6* recalled by IATA | F | AVCODES |
| 8971 | CLG | Chalair Aviation | | | ICAO1 |
| 8972 | CLG | Illinois Central Gulf R.R. Co. | 1/1975; eliminated 1/1976; 1/1980 | | NAKINA |
| 8973 | CLG | Illinois Central Gulf R.R. Co. | 1/75-1/80 | | NRHS |
| 8974 | CLG | *COLUMBUS & GREENVILLE RAILWAY CO. | | | PWRC |
| 8975 | CLG | *ILLINOIS CENTRAL GULF RAILROAD CO. | | | PWRC |
| 8976 | CLG | Chemion Logistik GmbH - Bahnbetriebe | | DE | VKM |
| 8977 | CLGA | C & L CARTAGE CO INC | | | SCAC3 |
| 8978 | CLGB | CLENDENNING, BILL TRUCKING INC | | | SCAC3 |
| 8979 | CLGC | COLGROVE CONTRACTORS INC | | | SCAC3 |
| 8980 | CLGC | CROSS LOGISTICS COMPANY INC | | | SCAC4 |
| 8981 | CLGE | COASTAL CAROLINA CARTAGE INC | | | SCAC3 |
| 8982 | CLGE | CELADON LOGISTICS SERVICES INC | | | SCAC4 |
| 8983 | CLGF | CRUISES LOGISTIC USA INC | | | SCAC4 |
| 8984 | CLGG | C L G TRUCKING | | | SCAC3 |
| 8985 | CLGH | CLOUGH, J H OILFIELD CONTRACTING SE | | | SCAC3 |
| 8986 | CLGH | CARGO LOGISTICS LLC | | | SCAC4 |
| 8987 | CLGJ | CONTINENTAL LOGISTICS INC | | | SCAC3 |
| 8988 | CLGK | CULLIGAN SOFT WATER SERVICE OF KERN | | | SCAC3 |
| 8989 | CLGK | CLYDE MARITIME SA | | | SCAC4 |
| 8990 | CLGM | CRESSLER LEASING CORP | | | SCAC3 |
| 8991 | CLGN | COLOGNE TRUCKING | | | SCAC3 |
| 8992 | CLGN | CHAMPS LOGISTICS INC | | | SCAC4 |
| 8993 | CLGO | CALGARY GOOSENECK SERVICE LTD | | | SCAC4 |
| 8994 | CLGP | COMPLETE LOGISTICS INC | | | SCAC4 |
| 8995 | CLGQ | CLOUD TRUCKING CO | | | SCAC3 |
| 8996 | CLGR | Central Louisiana & Gulf Ry. | added 10/1982; eliminated 1/1988 | | NAKINA |
| 8997 | CLGR | Central Louisiana & Gulf Ry. | added 10/82; eliminated 1/88 | | NRHS |
| 8998 | CLGR | CENTRAL LOUISIANA & GULF RAILROAD | | | PWRC |
| 8999 | CLGR | Central Louisiana and Gulf Railroad | | | RSRV |
| 9000 | CLGR | CLARK, GERALD | | | SCAC4 |
