| 1 | COT | Cottesmore FTU | Callsign: Cottesmore, ICAO callsign changed from Crater | GB | AVCODES |
| 2 | COT | Cottesmore FTU | Callsign: Crater, ICAO callsign changed to Cottesmore | GB | AVCODES |
| 3 | COT | Costa Airlines, C.A. | Callsign: Coair, | YV | AVCODES |
| 4 | COT | Cottesmore Flying Training Unit | | | ICAO1 |
| 5 | COT | Central Ontario Ry. (Canadian National Rys.) | 8/1920-7/1923 | | NAKINA |
| 6 | COT | Central Ontario Ry. (Canadian National Rys.) | 23-Jul | | NRHS |
| 7 | COT | *CANADIAN NATIONAL RWY. [CENTRAL ONTARIO RWY.] | | | PWRC |
| 8 | COT | *CITY OF TAMPA | | | PWRC |
| 9 | COT | *RETIRED 08-26-93 ATP | | | PWRC |
| 10 | COT | COLONIAL TRAILWAYS | | | SCAC4 |
| 11 | COT | | City: Cottbus | D | TRAFFIC |
| 12 | COTA | CONTRACT TRANSPORT SERVICE INC | | | SCAC3 |
| 13 | COTA | Central Ohio Transit Authority | | USA | TRAFFIC |
| 14 | COTB | COLOR TILE SUPERMARTS INC | | | SCAC3 |
| 15 | COTC | COMMERCIAL TRAFFIC SERVICES | | | SCAC3 |
| 16 | COTC | COLE OIL & TIRE CO INC | | | SCAC4 |
| 17 | COTE | COTE R INC | | | SCAC3 |
| 18 | COTE | COTTER, E P OIL CO INC | | | SCAC4 |
| 19 | COTF | COSTELLO, FRANK J JR | | | SCAC3 |
| 20 | COTG | COTTER MOVING & STORAGE COMPANY, TH | | | SCAC3 |
| 21 | COTH | COLE, THOMAS E | | | SCAC4 |
| 22 | COTI | CONTI TRUCKING INC | | | SCAC3 |
| 23 | COTI | CORNIVER TECHNOLOGIES INC | | | SCAC4 |
| 24 | COTJ | COWEN TRUCK LINE INC | | | SCAC3 |
| 25 | COTJ | COWEN TRUCK LINE INC | | | SCAC4 |
| 26 | COTK | COTTER TRUCKING COMPANY INC | | | SCAC4 |
| 27 | COTL | CONTINENTAL TRANSPORTATION LINES | | | PWRC |
| 28 | COTL | COTTRELL TRUCK LINES INC | | | SCAC3 |
| 29 | COTL | COTTRELL TRUCK LINES INC | | | SCAC4 |
| 30 | COTM | COTE, MIDDY | | | SCAC3 |
| 31 | COTM | CONTINUUM TRANSPORTATION SERVICES L | | | SCAC4 |
| 32 | COTN | COTTON, RICHARD E | | | SCAC3 |
| 33 | COTN | CORETRANS LLC | | | SCAC4 |
| 34 | COTO | COTTLES TRUCKING AND FUEL SERVICE | | | SCAC3 |
| 35 | COTO | COUNTRY TRANSPORT | | | SCAC4 |
| 36 | COTP | COTE, LOUIS P, INC | | | SCAC3 |
| 37 | COTQ | COLONIAL TANK TRANSPORT | | | SCAC3 |
| 38 | COTQ | COASTAL TRUCKING CO INC | | | SCAC4 |
| 39 | COTR | CHAMPION DIVISION TRUCKS | | | SCAC3 |
| 40 | COTR | CLASS ONE TRANSPORT LLC | | | SCAC4 |
| 41 | COTR | Compagnie des transports angevins | City: Angers | F | TRAFFIC |
| 42 | COTRA | Cotra Logistics Solutions BV | | NL | TRAFFIC |
| 43 | COTS | COMPTON TRANSFER & STORAGE CO | | | SCAC4 |
| 44 | COTS | Cotswold Rail | Real: CR, Cotswold Rail is a spot-hire company of shunting and mainline locomotives, based in Moreton-in-Marsh, Gloucestershire. | GB | TRAFFIC |
| 45 | COTT | CONTINENTAL TRANSPORT SYSTEMS INC | | | SCAC3 |
| 46 | COTT | CAPITAL 1 TRANSPORT LLC | | | SCAC4 |
| 47 | COTU | CONTARES-CONQUEREL | | | SCAC3 |
| 48 | COTU | RABANCO COMPANIES | | | SCAC4 |
| 49 | COTV | CONTINENTAL VAN LINES | | | SCAC3 |
| 50 | COTX | GLNX Corp. | added 1/1996; eliminated 7/1998; 7/2000-7/2005 (not listed) | | NAKINA |
| 51 | COTX | Jansen Rail Car, Inc. | added 4/1989; 1/1994; eliminated 1/1996 | | NAKINA |
| 52 | COTX | Consolidated Transportation Corp. | added 1/1981; eliminated 1/1989 | | NAKINA |
| 53 | COTX | Cudahy Packing Co. | 1/1945-4/1947 | | NAKINA |
| 54 | COTX | Cudahy Car Lines | 4/1938-1/1943 | | NAKINA |
| 55 | COTX | The Cudahy Oil Tank Line (Cudahy Car Lines) | 7/1932-7/1937 | | NAKINA |
| 56 | COTX | The Cudahy Oil Tank Line | 7/1923-7/1930 | | NAKINA |
| 57 | COTX | Consolidated Transportation Corp. | added 1/81; eliminated 1/89 | | NRHS |
| 58 | COTX | The Cudahy Oil Tank Line (Cudahy Car Lines) | Apr-38 | | NRHS |
| 59 | COTX | Jansen Rail Car, Inc. | added 4/89; 1/94; eliminated 1/96 | | NRHS |
| 60 | COTX | GLNX Corp. | added 1/96; eliminated 7/98; 7/2000 | | NRHS |
| 61 | COTX | *CUDAHY PACKING CO. [CUDAHY TANK LINES] | | | PWRC |
| 62 | COTX | *JANSEN RAILCAR, INC. [CONSOLIDATED TRANSPORTATION CORP.] | | | PWRC |
| 63 | COTX | +GLNX CORPORATION | | | PWRC |
| 64 | COTX | Consolidated Transportation Corporation (GLNX Corporation) | | | RSRV |
| 65 | COTX | GLNX CORPORATION | | | SCAC4 |
