| 4201 | TH | LAR Transregional, Linhas Aerea Regionais, S.A. | ICAO: PDF, Designator TH recalled by IATA | P | AVCODES |
| 4202 | TH | Transmile Air Services Sdn. Bhd. | ICAO: TSE, Callsign: Transmile, IATA designator changed to TH | MAL | AVCODES |
| 4203 | TH | British Airways CitiExpress Limited | ICAO: BRT, Callsign: British, Name change to BA Connect Limited on 01 February 2006. Name changed from British Regional Airlines Limited. Formerly Manx Airlines (Europe) Ltd. | GB | AVCODES |
| 4204 | TH | BA Connect Limited | ICAO: BRT, Callsign: British, Name change from British Airways CitiExpress Limited w.e.f. 01 February 2006. Merged into Flybe on 25 March 2007. | GB | AVCODES |
| 4205 | TH | Raya Airways Sdn. Bhd. d/b/a Raya Airways | ICAO: RMY, Callsign: Raya Express, IATA Prefix: 539, Name changed from Transmile Air Services. | MAL | AVCODES |
| 4206 | TH | Thomas, the Tank Engine and Friends | | TOY | TRAFFIC |
| 4207 | TH&B | Toronto, Hamilton & Buffalo Ry. | 8/1920-7/1936 | | NAKINA |
| 4208 | TH&B | TORONTO, HAMILTON & BUFFALO RWY. | | | PWRC |
| 4209 | THA | Thai Airways International Public Company Ltd. | IATA: TG, Callsign: Thai, IATA Prefix: 217, | T | AVCODES |
| 4210 | THA | Thai Airways International | IATA: TG | | ICAO1 |
| 4211 | THA | Thalys | | F | TRAFFIC |
| 4212 | THAA | THAI AIRWAYS INTERNATIONAL LTD | | | SCAC4 |
| 4213 | THAB | TRANSPORTES HERNANDEZ | | | SCAC4 |
| 4214 | THAD | TRANSPORT HALDARO INC | | | SCAC4 |
| 4215 | THAE | THERMO BOND BUILDINGS INC | | | SCAC4 |
| 4216 | THAG | TRANSPORTES HALCON | | | SCAC4 |
| 4217 | THAH | THOMAS & HOWARD COMPANY OF HICKORY | | | SCAC3 |
| 4218 | THAH | TRANSPORTES HERRERA | | | SCAC4 |
| 4219 | THAI | THRASHER TRUCKING | | | SCAC3 |
| 4220 | THAI | TRANSPORTES CHAIDES | | | SCAC4 |
| 4221 | THAI | Royal Thai Army | | T | TRAFFIC |
| 4222 | THAJ | THOMAS, A J & SONS INC | | | SCAC3 |
| 4223 | THAK | THIEBAUD AND STEINACHER TRUCKING | | | SCAC3 |
| 4224 | THAL | THORNE, AL TRANSPORT | | | SCAC3 |
| 4225 | THAL | Thalys | | F | TRAFFIC |
| 4226 | THAM | THAMES SALES YARD LTD | | | SCAC4 |
| 4227 | THAM | Thamesway Buses | | GB | TRAFFIC |
| 4228 | THAN | THREE AMIGOS SEAFOODS LTD | | | SCAC4 |
| 4229 | THAP | THOMAS PETROLEUM | | | SCAC4 |
| 4230 | THAR | THAMES RIVER MELONS LTD | | | SCAC4 |
| 4231 | THAS | THRONE AUTO SERVICE, INC | | | SCAC3 |
| 4232 | THAS | THASOS SHIPPING CO LTD | | | SCAC4 |
| 4233 | THAT | THOMAS, AL, TRUCKING, INC | | | SCAC3 |
| 4234 | THAT | THOMAS, AL TRUCKING INC | | | SCAC4 |
| 4235 | THAU | CHONGQING TONGHUI GAS CO., LTD. | | PRC | BIC |
| 4236 | THAU | TEKKOSHA HELLAS S.A.I. | | | SCAC3 |
| 4237 | THAU | TEKKOSHA HELLAS S.A.I. | | | SCAC4 |
| 4238 | THAV | T & H TRUCKING SERVICES INC | | | SCAC4 |
| 4239 | THAW | THOMAS & WATSON TRUCKING | | | SCAC3 |
| 4240 | THAW | THREE SSS GROUP LIMITED | | | SCAC4 |
| 4241 | THAX | THARALDSON ETHANOL PLANT I LLC | | | SCAC4 |
| 4242 | THAY | THAYERS WESTBORO & BOSTON EXPRESS, | | | SCAC3 |
| 4243 | THAZ | THOMPSON HARDWOOD | | | PWRC |
| 4244 | THB | Spark Air | | | ICAO1 |
| 4245 | THB | Toronto, Hamilton & Buffalo Ry. Co. | 4/1938-1/1980; eliminated 10/1987 | | NAKINA |
| 4246 | THB | CP Rail | 1/1994 | | NAKINA |
| 4247 | THB | CP Rail System | eliminated 1/1997 | | NAKINA |
| 4248 | THB | Canadian Pacific Ry. Co. | added 1/1997; 7/2000-7/2005 | | NAKINA |
| 4249 | THB | Toronto, Hamilton & Buffalo Ry. Co. | 4/38-1/80; eliminated 10/87 | | NRHS |
| 4250 | THB | CP Rail | Jan-94 | | NRHS |
| 4251 | THB | CP Rail System | eliminated 1/97 | | NRHS |
| 4252 | THB | Canadian Pacific Ry. Co. | added 1/97; 7/2000 | | NRHS |
| 4253 | THB | CANADIAN PACIFIC RWY. CO. (CP RAIL0 [TORONTO, HAMILTON & BUFFALO RY] | | | PWRC |
| 4254 | THB | Toronto, Hamilton and Buffalo Railway (Canadian Pacific Railway) | | | RSRV |
| 4255 | THB | Toronto, Hamilton & Buffalo Railway Co. | | CDN | TRAFFIC |
| 4256 | THB | Thurbo AG | | CH | VKM |
| 4257 | THBE | THUNDERBALL EXPRESS | | | SCAC3 |
| 4258 | THBE | TRANSPORTES HERMANOS BELTRAN S A DE | | | SCAC4 |
| 4259 | THBH | THOMAS BROS TRUCKING INC | | | SCAC3 |
| 4260 | THBI | THREE BROTHERS INC | | | SCAC3 |
| 4261 | THBI | THREE B TRANSPORT INC | | | SCAC4 |
| 4262 | THBJ | TH SERVICES INC | | | SCAC4 |
| 4263 | THBK | THREE B TRUCKING INC (3-B TRUCKING | | | SCAC3 |
| 4264 | THBK | TAR HEEL BROKERAGE LLC | | | SCAC4 |
| 4265 | THBL | THOMPSON, BOB LANDSCAPING & TRUCKIN | | | SCAC3 |
| 4266 | THBM | THOMPSON BUILDING MATERIALS INC | | | SCAC3 |
| 4267 | THBM | TWO HARBOURS MARINE | | | SCAC4 |
| 4268 | THBN | THEISEN BROTHERS INC | | | SCAC3 |
| 4269 | THBN | THREE ZERO EIGHT NINE-ZERO NINE FOU | | | SCAC4 |
| 4270 | THBO | THOMASTON TRANSPORTATION CO | | | SCAC3 |
| 4271 | THBP | THUNDERBOLT EXPRESS INC | | | SCAC3 |
| 4272 | THBR | THOMPSON BROS, INC | | | SCAC3 |
| 4273 | THBR | THORNE HILL TRUCKING | | | SCAC4 |
| 4274 | THBS | THREE B'S TRANSPORTATION COMPANY (3 | | | SCAC3 |
| 4275 | THBT | THIBAULT, LUC TRANSPORT INC | | | SCAC4 |
| 4276 | THBU | CONT-ASPHALT LTD. | | CH | BIC |
| 4277 | THBU | CONT-ASPHAL LIMITED | | | SCAC4 |
| 4278 | THBV | THOMPSON RIVER REDI MIX | | | SCAC4 |
| 4279 | THBY | THOMPSON HARVEY BAY AREA LLC | | | SCAC4 |
| 4280 | THC | Tar Heel Aviation, Inc. | Callsign: Tarheel, | USA | AVCODES |
| 4281 | THC | Transportes Nacionales, C.A. | Callsign: Tranaven, | YV | AVCODES |
| 4282 | THC | Tar Heel Aviation | | | ICAO1 |
| 4283 | THCA | 3-C TRUCKING, S.A.R. Distribution, INC | | | SCAC3 |
| 4284 | THCB | THREE ZERO THREE (303) CAB ASSOCIAT | | | SCAC3 |
| 4285 | THCD | T H C INC | | | SCAC3 |
| 4286 | THCF | THREE C INC (3 C INC) | | | SCAC3 |
| 4287 | THCF | THERMAL PROCESS SYSTEMS INC | | | SCAC4 |
| 4288 | THCG | THOMPSON CARTAGE INC | | | SCAC3 |
| 4289 | THCH | THOMPSON, CRUSE H | | | SCAC3 |
| 4290 | THCI | THICO INTERNATIONAL GROUP INC | | | SCAC3 |
| 4291 | THCK | TRANSPORT HAROLD CARRUTHERS INC | | | SCAC4 |
| 4292 | THCL | TOP HAT CHAYFFEURED LIMOUSINE SERVI | | | SCAC3 |
| 4293 | THCM | TRILLIUM HEALTH CARE | | | SCAC4 |
| 4294 | THCN | THOMPSON CONSTRUCTION CO | | | SCAC3 |
| 4295 | THCO | THRIFT TRUCKING CO | | | SCAC3 |
| 4296 | THCR | THREE COUNTRIES LLC | | | SCAC4 |
| 4297 | THCT | THETA CABLE TELEVISION | | | SCAC3 |
| 4298 | THCT | T H CARTAGE | | | SCAC4 |
| 4299 | THCV | TRANSPORTES HERMANOS CALDERON | | | SCAC4 |
| 4300 | THCW | THOMPSON CARRIERS INC | | | SCAC4 |
