| 17201 | CTTX | General American Transportation Corp. | 7/1937-1/1946 | | NAKINA |
| 17202 | CTTX | Canton Tank Car Co. | 7/1930-7/1935 | | NAKINA |
| 17203 | CTTX | Trailer Train Co. (not defined) | added 4/1961; 4/1961 | | NAKINA |
| 17204 | CTTX | Trailer Train Co. (FC flat cars equipped with container adapters, trailer hitches, bridge plates and safety chains) | 4/1963-7/1965 | | NAKINA |
| 17205 | CTTX | Trailer Train Co. (FC flat cars equipped with container adapters, trailer hitches and bridge plates) | 10/1966-1/1975 | | NAKINA |
| 17206 | CTTX | Trailer Train Co. | eliminated 1/1976; added 4/1976 | | NAKINA |
| 17207 | CTTX | Trailer Train Co./TTX Co. (flat cars equipped with coverless enclosed tri-level auto racks furnished by participant railroads) | 1/1980-7/2000 | | NAKINA |
| 17208 | CTTX | Canton Tank Car Co. | Apr-38 | | NRHS |
| 17209 | CTTX | Trailer Train Co. | added 4/61; 4/61-7/65 | | NRHS |
| 17210 | CTTX | Trailer Train Co. (FC flat cars equipped with container adapters, trailer hitches and bridge plates) | 10/66-1/75 | | NRHS |
| 17211 | CTTX | Trailer Train Co. | added 4/76 | | NRHS |
| 17212 | CTTX | Trailer Train Co. (flat cars equipped with coverless enclosed tri-level auto racks furnished by participant railroads) | 1/80; eliminated 1/92 | | NRHS |
| 17213 | CTTX | TTX Co. (flat cars equipped with coverless enclosed tri-level auto racks furnished by participant railroads) | added 1/92; 1/94-7/2000 | | NRHS |
| 17214 | CTTX | TTX COMPANY - TRAILER TRAIN CORP. {CANTON TANK CAR CO.; GATX} | | | PWRC |
| 17215 | CTTX | Trailer Train (TTX Corporation) | | | RSRV |
| 17216 | CTTX | TTX COMPANY | | | SCAC4 |
| 17217 | CTTY | COOPERS TRUCK & TRAILER SERVICES IN | | | SCAC3 |
| 17218 | CTTY | COUTTS LIBRARY SERVICES INC | | | SCAC4 |
| 17219 | CTTZ | CENTRAL TRANSPORT INTERNATIONAL | | | SCAC4 |
| 17220 | CTU | City Airways | Callsign: Cityline, | GB | AVCODES |
| 17221 | CTU | Limited Liability Company GloBus | IATA: XT, Callsign: Citywings, | RUS | AVCODES |
| 17222 | CTUA | CONTINENTAL TOURS & TRAVEL | | | SCAC3 |
| 17223 | CTUC | COLT TRUCK LINES INC | | | SCAC3 |
| 17224 | CTUD | COACH TOURS LIMITED | | | SCAC3 |
| 17225 | CTUD | COACH TOURS LIMITED | | | SCAC4 |
| 17226 | CTUE | CORT, EUGENE E | | | SCAC3 |
| 17227 | CTUF | CHANCE 2 TRANSPORT LTD | | | SCAC4 |
| 17228 | CTUG | CARRO TRUCKING INC | | | SCAC3 |
| 17229 | CTUH | COAST-TO-COAST PRODUCE LLC | | | SCAC4 |
| 17230 | CTUI | CENTURY TRANSPORTATION | | | SCAC3 |
| 17231 | CTUJ | CURTS TOURS INC | | | SCAC3 |
| 17232 | CTUL | CREEL TRUCKING | | | SCAC4 |
| 17233 | CTUN | COLE TRUCKING | | | SCAC3 |
| 17234 | CTUO | CAM TRUCKING CORP | | | SCAC3 |
| 17235 | CTUO | CONSTRUCTIVE TRANSPORT LLC | | | SCAC4 |
| 17236 | CTUP | CMC TRANSPORT | | | SCAC3 |
| 17237 | CTUQ | C & T TRUCKING INC | | | SCAC3 |
| 17238 | CTUQ | COLEMAN TRANSPORT | | | SCAC4 |
| 17239 | CTUR | CHARISONS TURKEY FARMS | | | SCAC4 |
| 17240 | CTUU | CZECH TECHNICAL UNIVERSITY IN PRAGUE | | CZ | BIC |
| 17241 | CTUU | CONTAINER TRADING CO. | | | PWRC |
| 17242 | CTUU | Container Trading | | | RSRV |
| 17243 | CTUU | CONTAINER TRADING CO (EQUIPMENT0 AG | | | SCAC3 |
| 17244 | CTUV | COSSAIRT TRUCKING SERVICE | | | SCAC3 |
| 17245 | CTUW | CAMELOT TRUCKING CO LTD | | | SCAC4 |
| 17246 | CTUY | CARTRU INC | | | SCAC3 |
| 17247 | CTV | Escuela de Pilotos Are Aviacion | Callsign: Are Aviacion, | E | AVCODES |
| 17248 | CTV | PT. Citilink Indonesia | IATA: QG, Callsign: Supergreen, | RI | AVCODES |
| 17249 | CTV | Escuela De Pilotos Are Aviacion | | | ICAO1 |
| 17250 | CTV | CONNECTICUT VALLEY | | | PWRC |
| 17251 | CTV | CargoTransVagon | | RO | TRAFFIC |
| 17252 | CTV | CARGO TRANS VAGON S.A. | | RO | VKM |
| 17253 | CTVA | CROLL TRAVEL LTD | | | SCAC3 |
| 17254 | CTVB | COOK, S M TRAVEL | | | SCAC3 |
| 17255 | CTVBG | Cargo Trans Wagon Blgaria AD | | BG | VKM |
| 17256 | CTVC | CONSOLIDATED TRANSPORT | | | SCAC3 |
| 17257 | CTVC | CENTRAL TRANSFER INC | | | SCAC4 |
| 17258 | CTVD | COOTS TRANSPORTATION SERVICES INC | | | SCAC3 |
| 17259 | CTVD | COOTS TRANSPORTATION SERVICES INC | | | SCAC4 |
| 17260 | CTVE | CARTERS TRAVEL SERVICE INC | | | SCAC3 |
| 17261 | CTVF | CROOMS TRANSPORTATION INC | | | SCAC3 |
| 17262 | CTVG | COLLINS TRUCKING COMPANY INC | | | SCAC3 |
| 17263 | CTVH | COMMAND TRANSPORT | | | SCAC4 |
| 17264 | CTVI | CONTINENTAL TRAVEL INC | | | SCAC3 |
| 17265 | CTVI | CALCO TRAVEL INC | | | SCAC4 |
| 17266 | CTVJ | Compagnie du Train à Vapeur de la Vallée de Joux | | CH | VKM |
| 17267 | CTVK | CANCO TRANSPORTATION SERVICES INC | | | SCAC3 |
| 17268 | CTVL | CARDILLO TRAVEL SYSTEM INC | | | SCAC3 |
| 17269 | CTVM | CRIMSON TRAVEL SERVICE | | | SCAC3 |
| 17270 | CTVM | CENTRAL TIRE SERVICE LIMITED | | | SCAC4 |
| 17271 | CTVN | CROSSROADS TRAVEL & TOURS | | | SCAC3 |
| 17272 | CTVO | CONSULTRANS (DIV OF ROWE TRANSPORTA | | | SCAC3 |
| 17273 | CTVO | CONSULTRANS, A DIVISION OF LIVINGST | | | SCAC4 |
| 17274 | CTVP | CHURCH TRAVEL AGENCY INC | | | SCAC3 |
| 17275 | CTVQ | C T L SHIPPING SERVICES HONG KONG | | | SCAC3 |
| 17276 | CTVR | COASTAL TRAILER REPAIR INC | | | SCAC3 |
| 17277 | CTVS | CENTURY VAN & STORAGE LTD | | | SCAC3 |
| 17278 | CTVS | CTV TELEVISION INC | | | SCAC4 |
| 17279 | CTVT | CTI MOVING & STORAGE | | | SCAC3 |
| 17280 | CTVV | CONTINENTAL TRAVEL INC | | | SCAC3 |
| 17281 | CTVV | CREATIVE CARRIAGE LTD | | | SCAC4 |
| 17282 | CTVW | CHASE TRANSPORTATION INC | | | SCAC3 |
| 17283 | CTVX | The Cleveland Terminal & Valley Ry., Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 17284 | CTVX | The Cleveland Terminal & Valley Ry., Inc. | Jul-00 | | NRHS |
| 17285 | CTVX | CLEVELAND TERMINAL & VALLEY RAILWAY | | | PWRC |
| 17286 | CTVX | Cleveland Terminal and Valley Railway | | | RSRV |
| 17287 | CTVX | CLEVELAND TERMINAL & VALLEY RAILWAY | | | SCAC4 |
| 17288 | CTVY | CLINTON AVENUE BUS COMPANY | | | SCAC3 |
| 17289 | CTVY | CONCEPT2 CTS INC | | | SCAC4 |
| 17290 | CTW | Cargo Three, Inc. | IATA: I3, Callsign: Third Cargo, IATA Prefix: 714, IATA Designator changed to 3J*. IATA Prefix code changed to 333. | PA | AVCODES |
| 17291 | CTW | Cargo Three Inc. d/b/a Pan Air Cargo | IATA: 3J, Callsign: Third Cargo, IATA Prefix: 333, IATA Designator changed from I3*. IATA Prefix code changed from 714. | PA | AVCODES |
| 17292 | CTW | Cargo Three, Inc. (Cargo Tres, Sociedad Anónima) | IATA: C3, Callsign: Third Cargo, IATA Prefix: 364, | PA | AVCODES |
| 17293 | CTW | Cargo Three | | | ICAO1 |
| 17294 | CTWB | CARTAGE & TRANSPORTATION SERVICES I | | | SCAC4 |
| 17295 | CTWE | CHI-TOWN EXPRESS | | | SCAC3 |
| 17296 | CTWE | CATE TRANSPORTATION | | | SCAC4 |
| 17297 | CTWF | CTW TRANSPORT INC | | | SCAC3 |
| 17298 | CTWF | CTW TRANSPORT INC | | | SCAC4 |
| 17299 | CTWG | COASTAL TOWING CO | | | SCAC3 |
| 17300 | CTWH | CAMPER TOURS INC | | | SCAC3 |
