| 1 | COS | Concors Latvian Air Service | Callsign: Concors, | LV | AVCODES |
| 2 | COS | Conus, Inc. | Callsign: Conus, | USA | AVCODES |
| 3 | COS | COSFER | | IT | VKM |
| 4 | COSA | COLLINS & COMPANY | | | SCAC4 |
| 5 | COSB | COBOS TRANSPORTATION EXPRESS INC | | | SCAC4 |
| 6 | COSD | COTA SANDOVAL, FERNANDO | | | SCAC4 |
| 7 | COSE | C O S DISTRIBUTION INC | | | SCAC3 |
| 8 | COSF | Costaferroviaria | | I | TRAFFIC |
| 9 | COSF | CONTRATAS Y SERVICIOS FERROVIARIOS, (COSFESA) | | ES | VKM |
| 10 | COSFER | Cosfer Spa | | I | TRAFFIC |
| 11 | COSG | CONTI-OSG ASSOCIATES | | | SCAC3 |
| 12 | COSG | CORONEL GARCIA, SERGIO | | | SCAC4 |
| 13 | COSH | CONRAD, E TRUCKING INC | | | SCAC3 |
| 14 | COSJ | CARLOS TRUCKING INC | | | SCAC4 |
| 15 | COSK | CONTAINER SERVICES TRUCKING CO | | | SCAC3 |
| 16 | COSK | COASTAL TRANSPORTATION SERVICES INC | | | SCAC4 |
| 17 | COSM | COSSITT MOTOR EXP INC | | | PWRC |
| 18 | COSM | CROUSE TRANSFER & STORAGE INC | | | SCAC3 |
| 19 | COSM | COSMAN, KEITH F TRUCKING | | | SCAC4 |
| 20 | COSN | COUNTRYSTYLE INC | | | SCAC3 |
| 21 | COSN | CONSUMERS OIL& SUPPLY COMPANY | | | SCAC4 |
| 22 | COSO | COUSINO, B L | | | SCAC3 |
| 23 | COSP | COLORADO SHIPPERS COOPERATIVE INC | | | SCAC3 |
| 24 | COSP | COLUMBIA SHIPMANAGEMENT LTD | | | SCAC4 |
| 25 | COSQ | CONTAINER SOLUTIONS | | | SCAC4 |
| 26 | COSR | COLORADO STEEL & WIRE TRANSPORTATIO | | | SCAC3 |
| 27 | COSS | CORNERSTONE CARRIERS | | | SCAC4 |
| 28 | COST | CONATSER TRUCKING INC | | | SCAC3 |
| 29 | COSTI | Costiero Gas | | I | TRAFFIC |
| 30 | COSU | CHINA OCEAN SHIPPERS COMPANY | | | PWRC |
| 31 | COSU | China Ocean Steamship ( Coscon ContaineLines) | | | RSRV |
| 32 | COSU | CHINA OCEAN STEAMSHIP LTD | | | SCAC3 |
| 33 | COSU | CHINA OCEAN SHIPPING COMPANY | | | SCAC4 |
| 34 | COSW | CROSSOCEAN SHIPPING CO., INC. | | | SCAC3 |
| 35 | COSW | COASTAL AIR FREIGHT | | | SCAC4 |
| 36 | COSX | Cabot Corp., CAB-O-SIL Division | added 7/1985; 1/1994-7/2000; eliminated 10/2000; 7/2005 (not listed) | | NAKINA |
| 37 | COSX | D-X Sunray Oil Co. | 10/1957; eliminated 10/1959 | | NAKINA |
| 38 | COSX | Mid-Continent Petroleum Corp. | 7/1937-7/1954 | | NAKINA |
| 39 | COSX | Cosden & Co. Mid-Continent Petroleum Corp. | 7/1935 | | NAKINA |
| 40 | COSX | Cosden & Co. | 8/1920-7/1932 | | NAKINA |
| 41 | COSX | Mid-Continent Petroleum Corp. | 4/38-1/52 | | NRHS |
| 42 | COSX | D-X Sunray Oil Co. | 10/57; eliminated 10/59 | | NRHS |
| 43 | COSX | Cabot Corp., CAB-O-SIL Division | 1/94-7/2000; eliminated 10/2000 | | NRHS |
| 44 | COSX | *COSDEN & CO. | | | PWRC |
| 45 | COSX | *CITY OF SPENCER | | | PWRC |
| 46 | COSX | +CABOT CORPORATION, CAB-O-SIL DIVISION [D-X SUNRAY OIL CO.; MID-CONTINENT PETROLEUM CORP.] | | | PWRC |
| 47 | COSX | Cabot Corporation (CAB-O-SIL Division) | | | RSRV |
| 48 | COSX | CABOT CORPORATION, CAB-O-SIL DIVISI | | | SCAC4 |
| 49 | COSX | Cosden & Co. Mid-Continent Petroleum Company | | USA | TRAFFIC |
| 50 | COSZ | COAL SPRING INDUSTRIES | | | PWRC |
