| 1 | CLG | Chalair | Callsign: Challair, Name changed to Chalair Aviation. Designator M6* recalled by IATA | F | AVCODES |
| 2 | CLG | Chalair | IATA: M6, Callsign: Challair, Designator M6* recalled by IATA | F | AVCODES |
| 3 | CLG | Chalair Aviation | IATA: CE, Callsign: Challair, Name changed from Chalair. Designator M6* recalled by IATA | F | AVCODES |
| 4 | CLG | Chalair Aviation | | | ICAO1 |
| 5 | CLG | Illinois Central Gulf R.R. Co. | 1/1975; eliminated 1/1976; 1/1980 | | NAKINA |
| 6 | CLG | Illinois Central Gulf R.R. Co. | 1/75-1/80 | | NRHS |
| 7 | CLG | *COLUMBUS & GREENVILLE RAILWAY CO. | | | PWRC |
| 8 | CLG | *ILLINOIS CENTRAL GULF RAILROAD CO. | | | PWRC |
| 9 | CLG | Chemion Logistik GmbH - Bahnbetriebe | | DE | VKM |
| 10 | CLGA | C & L CARTAGE CO INC | | | SCAC3 |
| 11 | CLGB | CLENDENNING, BILL TRUCKING INC | | | SCAC3 |
| 12 | CLGC | COLGROVE CONTRACTORS INC | | | SCAC3 |
| 13 | CLGC | CROSS LOGISTICS COMPANY INC | | | SCAC4 |
| 14 | CLGE | COASTAL CAROLINA CARTAGE INC | | | SCAC3 |
| 15 | CLGE | CELADON LOGISTICS SERVICES INC | | | SCAC4 |
| 16 | CLGF | CRUISES LOGISTIC USA INC | | | SCAC4 |
| 17 | CLGG | C L G TRUCKING | | | SCAC3 |
| 18 | CLGH | CLOUGH, J H OILFIELD CONTRACTING SE | | | SCAC3 |
| 19 | CLGH | CARGO LOGISTICS LLC | | | SCAC4 |
| 20 | CLGJ | CONTINENTAL LOGISTICS INC | | | SCAC3 |
| 21 | CLGK | CULLIGAN SOFT WATER SERVICE OF KERN | | | SCAC3 |
| 22 | CLGK | CLYDE MARITIME SA | | | SCAC4 |
| 23 | CLGM | CRESSLER LEASING CORP | | | SCAC3 |
| 24 | CLGN | COLOGNE TRUCKING | | | SCAC3 |
| 25 | CLGN | CHAMPS LOGISTICS INC | | | SCAC4 |
| 26 | CLGO | CALGARY GOOSENECK SERVICE LTD | | | SCAC4 |
| 27 | CLGP | COMPLETE LOGISTICS INC | | | SCAC4 |
| 28 | CLGQ | CLOUD TRUCKING CO | | | SCAC3 |
| 29 | CLGR | Central Louisiana & Gulf Ry. | added 10/1982; eliminated 1/1988 | | NAKINA |
| 30 | CLGR | Central Louisiana & Gulf Ry. | added 10/82; eliminated 1/88 | | NRHS |
| 31 | CLGR | CENTRAL LOUISIANA & GULF RAILROAD | | | PWRC |
| 32 | CLGR | Central Louisiana and Gulf Railroad | | | RSRV |
| 33 | CLGR | CLARK, GERALD | | | SCAC4 |
| 34 | CLGS | CALGARY GOOSENECK SERVICE LTD | | | SCAC3 |
| 35 | CLGT | CLARK, GEORGE TRANSIT COMPANY | | | SCAC3 |
| 36 | CLGT | COMERCIALIZADORA LUIS GUTIERREZ SA | | | SCAC4 |
| 37 | CLGU | GASCO GLP S.A | | RCH | BIC |
| 38 | CLGU | COSTA LINE CARGO SERVICES | | | PWRC |
| 39 | CLGU | Costa Line Cargo Services | | | RSRV |
| 40 | CLGU | CONTSHIP UK LTD | | | SCAC3 |
| 41 | CLGU | CP SHIPS | | | SCAC4 |
| 42 | CLGV | CRAILINS LOGISTIC SERVICES INC | | | SCAC4 |
| 43 | CLGW | CHOSAN LIMITED | | | SCAC3 |
| 44 | CLGX | The Clarendon Gasoline Co. | 8/1920 | | NAKINA |
| 45 | CLGX | CLARENDON GASOLINE CO. | | | PWRC |
| 46 | CLGY | C & L TRUCKING | | | SCAC3 |
| 47 | CLGY | COUNTYLINE FREIGHTWAYS LLC | | | SCAC4 |
