| 8701 | CL | Capitol International Airways | Callsign: Capitol, | USA | AVCODES |
| 8702 | CL | Capitol Airlines, Inc. | ICAO: CAP, Callsign: Capitol, Desigantor CL recalled by IATA | USA | AVCODES |
| 8703 | CL | Cargolink AS | | NO | VKM |
| 8704 | CLA | Color Air | Callsign: Pennant, Commenced operations on 01 August 1998. Ceased operations on 27 September 1999. Commenced operations on 01 August 1998. | N | AVCODES |
| 8705 | CLA | Colombia | IATA: KW, Callsign: Columbia, | I | AVCODES |
| 8706 | CLA | Comlux Aviation AG | Callsign: Comlux, | CH | AVCODES |
| 8707 | CLA | Comlux Aviation | | | ICAO1 |
| 8708 | CLA | Chełmskie Linie Autobusowe Spółka z o.o. | City: Chelm | PL | TRAFFIC |
| 8709 | CLAA | C-LA TRUCKING INC | | | SCAC4 |
| 8710 | CLAB | CLAUDES INC | | | SCAC3 |
| 8711 | CLAC | CLANCY-CULLEN STORAGE CO, INC | | | SCAC3 |
| 8712 | CLAD | CLANCYS DELIVERY SERVICE | | | SCAC3 |
| 8713 | CLAE | CLAUSEN TRANSFER AND STORAGE INC | | | SCAC3 |
| 8714 | CLAE | CLARK, W A TRUCKING INC | | | SCAC4 |
| 8715 | CLAF | COLONIAL AIR EXPRESS | | | SCAC3 |
| 8716 | CLAG | CLANCY, GEORGE M CARTING CO INC | | | SCAC3 |
| 8717 | CLAG | CLELAND SITE PREP INC | | | SCAC4 |
| 8718 | CLAH | CLAUSEN, J C | | | SCAC3 |
| 8719 | CLAI | CLARK, ALLEN INC | | | SCAC3 |
| 8720 | CLAI | CALLAHAN BUS LINES INC | | | SCAC4 |
| 8721 | CLAJ | CLA INC | | | SCAC4 |
| 8722 | CLAK | CAL-ARK INTERNATIONAL INC | | | SCAC4 |
| 8723 | CLAM | CROWLEY LATIN AMERICA SERVICES LLC | | | SCAC4 |
| 8724 | CLAN | CLANCY CARTING & STORAGE CO INC | | | SCAC3 |
| 8725 | CLAO | CLAREDEN-BRETON TRUCK | | | SCAC3 |
| 8726 | CLAO | CASELLA TRANSPORTATION INC | | | SCAC4 |
| 8727 | CLAP | CRESCENT SHIPPERS OF LA INC | | | SCAC4 |
| 8728 | CLAR | CLARION RIVER RWY. | | | PWRC |
| 8729 | CLAR | CLARKSON BROS MACHINERY HAULERS, IN | | | SCAC3 |
| 8730 | CLAR | CLARKSON BROS MACHINERY HAULERS, IN | | | SCAC4 |
| 8731 | CLARI | CLARIANT SPECIALTY FINE CHEMICALS (France) S.A.S. | | FR | VKM |
| 8732 | CLAS | CLINTON ALUMINUM & STAINLESS STEEL | | | SCAC4 |
| 8733 | CLASB | Classic Bus Hire | | GB | TRAFFIC |
| 8734 | CLASC | Classic Charter (Ludwig & Son) | | CDN | TRAFFIC |
| 8735 | CLAT | CLATTERBUCK HORSE TRANSPORTATION | | | SCAC3 |
| 8736 | CLAT | CLARY TRUCKING INC | | | SCAC4 |
| 8737 | CLAT | Classic Tours | | US-NJ | TRAFFIC |
| 8738 | CLAU | CLASQUIN SA | | F | BIC |
| 8739 | CLAU | CONTI LINES N V | | | SCAC4 |
| 8740 | CLAV | CLAVIERS BAROQUES | | | SCAC4 |
| 8741 | CLAX | Guardian Leasing, Inc. | 7/2005 (not listed) | | NAKINA |
| 8742 | CLAX | Clayton Oil & Refining Co. | 7/1923 | | NAKINA |
| 8743 | CLAX | *CLAYTON OIL & REFINING CO. | | | PWRC |
| 8744 | CLAX | +GUARDIAN LEASING, INC. | | | PWRC |
| 8745 | CLAX | GUARDIAN LEASING INC | | | SCAC4 |
| 8746 | CLAY | CLAY CENTER FREIGHT SERVICE | | | SCAC3 |
| 8747 | CLAY | CLAYTON INDUSTRIES | | | SCAC4 |
| 8748 | CLB | CAA Calibration Flight | Callsign: Calibrator, Name changed to Flight Precision Limited | GB | AVCODES |
| 8749 | CLB | Flight Precision Limited | Callsign: Calibrator, Name changed to Cobham Flight Inspection Ltd. Formerly CAA Calibration Flight. ICAO callsign changed from Calibration | GB | AVCODES |
| 8750 | CLB | Cobham Flight Inspection Limited | Callsign: Calibrator, Name changed from Flight Precision Limited. Formerly CAA Calibration Flight | GB | AVCODES |
| 8751 | CLB | Flight Precision Limited | | | ICAO1 |
| 8752 | CLB | Chiemgauer Lokalbahn eV | Olbing | D | privat-bahn.de |
| 8753 | CLB | Chiemgauer Lokalbahn Betriebsgesellschaft mbH & Co KG | | DE | VKM |
| 8754 | CLBA | COLUMBIA TRUCKING | | | SCAC3 |
| 8755 | CLBB | CARROLL, BOBBY | | | SCAC3 |
| 8756 | CLBC | COLUMBUS CHARTER COACH INC | | | SCAC3 |
| 8757 | CLBC | COLUMBUS CHARTER COACH INC | | | SCAC4 |
| 8758 | CLBD | COLBY DIRECT DELIVERY | | | SCAC4 |
| 8759 | CLBE | CULBERSON TRANSPORT INC | | | SCAC4 |
| 8760 | CLBF | COLUMBIA FOODS INC | | | SCAC3 |
| 8761 | CLBG | CONSTRUCTORA DEL NORESTE SA | | | SCAC4 |
| 8762 | CLBH | CARLSON BROTHERS | | | SCAC3 |
| 8763 | CLBH | COLUMBIA EQUIPMENT SALES | | | SCAC4 |
| 8764 | CLBI | CLINE, BILL TRANSPORTATION CO | | | SCAC3 |
| 8765 | CLBJ | CALABRO, J TRANSPORT | | | SCAC3 |
| 8766 | CLBK | CENTAUR LIQUID AND DRY BULK CO | | | SCAC3 |
| 8767 | CLBL | CALABRIA LEASING INC | | | SCAC3 |
| 8768 | CLBLO | C +L Consult & Logistik GmbH | | DE | VKM |
| 8769 | CLBM | COLUMBIA MOVING & STORAGE INC | | | SCAC3 |
| 8770 | CLBM | CHAMPAGNE LUMBER CO INC | | | SCAC4 |
| 8771 | CLBN | CLIBURN TANK LINES INC | | | SCAC3 |
| 8772 | CLBN | CLIBURN TANK LINES INC | | | SCAC4 |
| 8773 | CLBO | COLUMBIA OIL COMPANY, THE | | | SCAC3 |
| 8774 | CLBQ | COLUMBUS DISTRIBUTING CO INC | | | SCAC3 |
| 8775 | CLBS | CARLIE BEADS | | | SCAC4 |
| 8776 | CLBT | CLARK BROS. TRANSFER, INC | | | SCAC3 |
| 8777 | CLBT | CLARK BROS TRANSFER, INC | | | SCAC4 |
| 8778 | CLBU | CONTAINER LEASING A.G. | | | SCAC3 |
| 8779 | CLBV | COLUMBIA TRANSPORT CORP | | | SCAC3 |
| 8780 | CLBV | CLARKS BLUFF VAN LINES | | | SCAC4 |
| 8781 | CLBX | Can-Lease Produce Transportation Ltd. | added 1/1972; eliminated 7/1974 | | NAKINA |
| 8782 | CLBX | Can-Lease Produce Transportation Ltd. | added 1/72; eliminated 7/74 | | NRHS |
| 8783 | CLBX | CAN-LEASE PRODUCE TRANSPORTATION LTD. | | | PWRC |
| 8784 | CLBY | COLBY TRANSPORT | | | SCAC3 |
| 8785 | CLBY | COLBY TRANSPORT | | | SCAC4 |
| 8786 | CLC | Classic Air AG | Callsign: Classic Air, | CH | AVCODES |
| 8787 | CLC | Columbia & Cowlitz Ry. Co. | 1/1975-7/2005 | | NAKINA |
| 8788 | CLC | Columbia & Cowlitz Ry. Co. | 1/75-7/2000 | | NRHS |
| 8789 | CLC | COLUMBIA & COWLITZ RAILWAY COMPANY | | | PWRC |
| 8790 | CLC | Columbia and Cowlitz Railway | | | RSRV |
| 8791 | CLC | Columbia and Cowlitz | | USA | TRAFFIC |
| 8792 | CLCB | CLYDES CUSTOM BODY & PAINT | | | SCAC3 |
| 8793 | CLCC | CLUTCH CARGO INTERNATIONAL INC | | | SCAC3 |
| 8794 | CLCC | CLUTCH GLOBAL LOGISTICS | | | SCAC4 |
| 8795 | CLCD | CALIFORNIA CONSOLIDATED ENTERPRISES | | | SCAC3 |
| 8796 | CLCD | CL CONSOLIDATORS SERVICES LTD | | | SCAC4 |
| 8797 | CLCF | CALICO FUELS INC | | | SCAC3 |
| 8798 | CLCF | COOL CREEK FARM | | | SCAC4 |
| 8799 | CLCG | COLLINS CARTAGE CORP | | | SCAC3 |
| 8800 | CLCH | CLINCH CO INC | | | SCAC3 |
