| 1 | CLE | Chileinter Airlines | Callsign: Chileinter, | RCH | AVCODES |
| 2 | CLE | Colemill Enterprises | Callsign: Colemill, | USA | AVCODES |
| 3 | CLE | Colemill Enterprises | | | ICAO1 |
| 4 | CLE | The Cincinnati and Lake Erie Railroad | Real: C&LE | USA | TRAFFIC |
| 5 | CLEA | CHEMICAL LEAMAN TANK LINES, INC | | | SCAC3 |
| 6 | CLEC | CLEMMER MOVING & STORAGE INC | | | SCAC3 |
| 7 | CLEC | CLEMMER MOVING & STORAGE INC | | | SCAC4 |
| 8 | CLED | CLEVELAND CARTAGE CO THE | | | SCAC3 |
| 9 | CLED | COUNTY LINE EXPRESS INC (DEDICATED | | | SCAC4 |
| 10 | CLEF | CLASSIC CARGO INC (AIR FREIGHT FORW | | | SCAC4 |
| 11 | CLEF | Tramway de Clermont-Ferrand | Real: SMTC | F | TRAFFIC |
| 12 | CLEG | CLEVELAND SYRUP CORPORATION | | | SCAC3 |
| 13 | CLEI | CLEVELAND ELECTRIC ILLUMINATING CO. | | | PWRC |
| 14 | CLEI | CAL LEASING | | | SCAC3 |
| 15 | CLEI | CHS FUEL CO LLC | | | SCAC4 |
| 16 | CLEJ | CLEMENTS TRUCKING CO | | | SCAC3 |
| 17 | CLEK | COLLIE EQUIPMENT AND MANUFACTURING | | | SCAC3 |
| 18 | CLEL | COLEMAN EDUCATIONAL TRUST | | | SCAC3 |
| 19 | CLEM | CLEMANS TRUCK LINE INC | | | PWRC |
| 20 | CLEM | CLEMENTS TRUCKING | | | SCAC3 |
| 21 | CLEM | COLT EXPRESS | | | SCAC4 |
| 22 | CLEN | CLE-MAR CARTAGE INC | | | SCAC3 |
| 23 | CLEN | CHALLENGER FREIGHT SYSTEMS | | | SCAC4 |
| 24 | CLEO | COLONIE TRUCK LEASING | | | SCAC3 |
| 25 | CLEQ | CLEMENTS CONSTRUCTION COMPANY INC | | | SCAC3 |
| 26 | CLEQ | COLT LOGISTICS INC | | | SCAC4 |
| 27 | CLER | CLEMENS, R F & SONS INC | | | SCAC3 |
| 28 | CLER | CLEMENS, R F & SONS INC | | | SCAC4 |
| 29 | CLES | COLE TRANSPORT CORP | | | SCAC3 |
| 30 | CLET | CLETEX TRUCKING, INC | | | SCAC3 |
| 31 | CLET | Československé letectvo | | CS | TRAFFIC |
| 32 | CLEU | CLEAN HARBORS ENVIRONMENTAL SERVICES, INC | | USA | BIC |
| 33 | CLEU | EUROPORT SP. Z.O.O. | | PL | VKM |
| 34 | CLEV | CLEVELANDS TRUCK LINES, INC | | | SCAC3 |
| 35 | CLEV | CLEVELAND, KEVIN L | | | SCAC4 |
| 36 | CLEW | CLEARWATER TRUCKING INC | | | SCAC3 |
| 37 | CLEX | Cleco Corp. | 7/2000-7/2005 | | NAKINA |
| 38 | CLEX | Chemical Enterprises, Inc. | added 1/1984; eliminated 4/1990 | | NAKINA |
| 39 | CLEX | Cleco Corp. | Jul-00 | | NRHS |
| 40 | CLEX | Chemical Enterprises, Inc. | eliminated 4/90 | | NRHS |
| 41 | CLEX | *CHEMICAL ENTERPRISES INC. | | | PWRC |
| 42 | CLEX | +CLECO CORPORATION | | | PWRC |
| 43 | CLEX | Chemical Enterprises (Cieco Corporation) | | | RSRV |
| 44 | CLEX | CLECO CORPORATION | | | SCAC4 |
| 45 | CLEY | CONLEY MOTOR FREIGHT INC | | | SCAC3 |
