| 9201 | TSO | Transaero Airlines | IATA: UN, Callsign: Transoviet, IATA Prefix: 670, Founded on 28 December 1990. Commenced operations on 05 November 1991. Ceased operations on 25 October 2015. | RUS | AVCODES |
| 9202 | TSO | Transaero Airlines | IATA: 4J, IATA designator changed to UN | RUS | AVCODES |
| 9203 | TSO | Transaero Airlines | IATA: UN | | ICAO1 |
| 9204 | TSO | Tidewater Southern Ry. | 4/1938-7/1954 | | NAKINA |
| 9205 | TSO | Tidewater Southern Ry. | 4/38-1/52 | | NRHS |
| 9206 | TSO | TIDEWATER SOUTHERN RWY. | | | PWRC |
| 9207 | TSO | Travaux de Sud-Ouest | | F | TRAFFIC |
| 9208 | TSO | TSO | | FR | VKM |
| 9209 | TSOA | TRANSPORTES R SOTELO | | | SCAC4 |
| 9210 | TSOA | Transaero | Real: TSO | RUS | TRAFFIC |
| 9211 | TSOB | TELFER SHELDON OIL COMPANY | | | SCAC4 |
| 9212 | TSOD | TALLE DE SOLDADURA Y FORJA EL BORRA | | | SCAC4 |
| 9213 | TSOF | T S A FREIGHTLINES INC | | | SCAC4 |
| 9214 | TSOH | TRI-STATE PTEROLEUM PRODUCTS INC | | | SCAC4 |
| 9215 | TSOI | TRANSPORTES SOLIS | | | SCAC4 |
| 9216 | TSOJ | TRANSPORT SOLUTIONS | | | SCAC4 |
| 9217 | TSOL | | City: Lausanne | CH | TRAFFIC |
| 9218 | TSOL | TSOL, société du tramway du sud-ouest lausannois SA | | CH | VKM |
| 9219 | TSOM | TOWNSEND OIL CO INC | | | SCAC4 |
| 9220 | TSON | TRIPLE S TRANSPORTATION INC | | | SCAC4 |
| 9221 | TSOSA | Tabor Szynowy Opole SA | | PL | TRAFFIC |
| 9222 | TSOSA | Tabor Szynowy” Opole Spółka Akcyjna | | PL | VKM |
| 9223 | TSOT | TRI STAR TRANSPORT LLC | | | SCAC4 |
| 9224 | TSOU | TONG SENG APPLIED MATERIALS INC. | | RC | BIC |
| 9225 | TSOU | TRANSPORTNIYE RESHENIYA CO LTD | | | SCAC4 |
| 9226 | TSOW | TRANSPORT SO CAL INC | | | SCAC4 |
| 9227 | TSOZ | Tank Solutions | | | RSRV |
| 9228 | TSOZ | TANK SOLUTIONS INC | | | SCAC4 |
| 9229 | TSP | Transportes Aereos Inter, S.A. | Callsign: Transpo-Inter, | GCA | AVCODES |
| 9230 | TSP | Tonlesap Airlines | IATA: K9, Callsign: Tonlesap Air, IATA Prefix: 443, Founded in 2011. Ceased operations in 2013. | K | AVCODES |
| 9231 | TSP | Transportes Aereos Inter | | | ICAO1 |
| 9232 | TSP | TERMOELECTRICA SA - SUCURSALA TERMOSERV PAROSENI | | RO | VKM |
| 9233 | TSPA | TRANSPORT ST-PAMPHILE INC | | | SCAC4 |
| 9234 | TSPC | TRANSPORT SERGE POTVIN INC | | | SCAC4 |
| 9235 | TSPE | TRIPLE S PETROLEUM CO | | | SCAC4 |
| 9236 | TSPK | TOLEDO SECURITY PACKAGE | | | SCAC4 |
| 9237 | TSPM | TRANSPORTES MATA | | | SCAC4 |
| 9238 | TSPN | TRANSPETROL MARITIME SERVICES LTD | | | SCAC4 |
| 9239 | TSPP | TRANSPORTES PONY EXPRESS | | | SCAC4 |
| 9240 | TSPR | T & S TRANSPORT | | | SCAC4 |
| 9241 | TSPT | TRANSPORT BGS | | | SCAC4 |
| 9242 | TSPU | PARATORI S.P.A. | | I | BIC |
| 9243 | TSPV | TRANSPORTES ARGUELLES | | | SCAC4 |
| 9244 | TSPW | TRANSIT PLANNERS INC | | | SCAC4 |
| 9245 | TSPX | Service Oil Refining Co. | 8/1920 | | NAKINA |
| 9246 | TSPX | Texas Sulphur Products Co., Inc. | added 4/1977; eliminated 4/1979 | | NAKINA |
| 9247 | TSPX | Texas Sulphur Products Co. | added 4/1979; 1/1980; eliminated 7/1985 | | NAKINA |
| 9248 | TSPX | Newmont Nevada Energy Investment LLC | added 10/2007 | | NAKINA |
| 9249 | TSPX | Texas Sulphur Products Co., Inc. | eliminated 4/79 | | NRHS |
| 9250 | TSPX | Texas Sulphur Products Co. | added 4/79; 1/80 | | NRHS |
| 9251 | TSPX | *TEXAS SULPHUR PRODUCTS COMPANY | | | PWRC |
| 9252 | TSPX | +NEWMONT NEVADA ENERGY INVESTMENT, LLC | | | PWRC |
| 9253 | TSPX | Texas Sulphur Products | | | RSRV |
| 9254 | TSPX | NEWMONT NEVADA ENERGY INVESTMENT LL | | | SCAC4 |
| 9255 | TSPY | TRADING STAMP PRINTERS AND SUPPLY C | | | SCAC4 |
| 9256 | TSPZ | TRANSAMERICA LEASING INCORPORATED | | | PWRC |
| 9257 | TSPZ | TAL International (BNSF Railway) | | | RSRV |
| 9258 | TSPZ | TRANSAMERICA LEASING INC | | | SCAC4 |
| 9259 | TSQ | Air Transse Co., Ltd | Callsign: Airtra, | J | AVCODES |
| 9260 | TSQ | airtransse | | | ICAO1 |
| 9261 | TSQA | TRIPLE STAR LOGISTICS INC | | | SCAC4 |
| 9262 | TSQB | THREE ZERO NINE EIGHT-SIX ONE EIGHT | | | SCAC4 |
| 9263 | TSQD | TS LINES | | | SCAC4 |
| 9264 | TSQE | TSI | | | SCAC4 |
| 9265 | TSQI | TTSI LOGISTICS INC | | | SCAC4 |
| 9266 | TSQJ | TRANSPORT SUPERNOVA INC | | | SCAC4 |
| 9267 | TSQL | TRI-STAR LOGISTICS INC | | | SCAC4 |
| 9268 | TSQO | TRANSCOPE | | | SCAC4 |
| 9269 | TSQS | TRANSPORTS SOLUTIONS LLC | | | SCAC4 |
| 9270 | TSQV | TOP SINCE LOGISTICS INC | | | SCAC4 |
| 9271 | TSR | Trans Service Airlift | Callsign: Trans Service, | ZRE | AVCODES |
| 9272 | TSR | TJS San Marino | Callsign: San Marino, Subsidary of Tyrolean Jet Services. | RSM | AVCODES |
| 9273 | TSR | Trans Service Airlift | | | ICAO1 |
| 9274 | TSR | TEXAS STATE RAILROAD | | | PWRC |
| 9275 | TSR | Texas State Railroad | | USA | TRAFFIC |
| 9276 | TSR | TSR Recycling GMBH & CO. KG | | DE | VKM |
| 9277 | TSRA | TRANSPORT ROUT-AM INC | | | SCAC4 |
| 9278 | TSRC | TIDEWATER SOUTHERN RAILWAY CO. | | | PWRC |
| 9279 | TSRC | TRANSPORTES REFRIGERADOS CHONG | | | SCAC4 |
| 9280 | TSRD | Twin State R.R. Co. | added 10/1988; 1/1994-7/2005 | | NAKINA |
| 9281 | TSRD | Twin State R.R. Co. | added 10/88; 1/94-7/2000 | | NRHS |
| 9282 | TSRD | TWIN STATE RAILROAD COMPANY | | | PWRC |
| 9283 | TSRD | Twin State Railroad | | | RSRV |
| 9284 | TSRD | TWIN STATE RAILROAD COMPANY | | | SCAC4 |
| 9285 | TSRF | TRANSPORTES ROFRA | | | SCAC4 |
| 9286 | TSRG | TRI-STAR TRUCKING | | | SCAC4 |
| 9287 | TSRI | TEXAS SOUTHERN RAILROAD, INC. | | | PWRC |
| 9288 | TSRK | TRANSPORTATION SERVICES INC | | | SCAC4 |
| 9289 | TSRL | TRANSPORT RICHARD LABRIE INC | | | SCAC4 |
| 9290 | TSRN | TRANSTAR ONE AND ASSOCIATES INC | | | SCAC4 |
| 9291 | TSRR | Tennessee Southern R.R. Co., Inc. | added 7/1988; 1/1994; eliminated 7/1995; 7/2000-7/2005 | | NAKINA |
| 9292 | TSRR | Tennessee Southern R.R. Co., Inc. | added 7/88; 1/94; eliminated 7/95; 7/2000 | | NRHS |
| 9293 | TSRR | TENNESSEE SOUTHERN RAILROAD COMPANY, INC. | | | PWRC |
| 9294 | TSRR | Tennessee Southern Railroad | | | RSRV |
| 9295 | TSRR | TENNESSEE SOUTHERN RAILROAD CO INC | | | SCAC4 |
| 9296 | TSRR | Tennessee Southern R.R. Co., Inc. | | USA | TRAFFIC |
| 9297 | TSRU | TRANS SINERGIA | | RUS | BIC |
| 9298 | TSRU | TRANSRAIL GMBH | | | SCAC4 |
| 9299 | TSRX | ONEIL TRANSPORTATION SERVICES INC | | | SCAC4 |
| 9300 | TSRY | TRI-STATE RECOVERY | | | SCAC4 |
