| 1 | TSP | Transportes Aereos Inter, S.A. | Callsign: Transpo-Inter, | GCA | AVCODES |
| 2 | TSP | Tonlesap Airlines | IATA: K9, Callsign: Tonlesap Air, IATA Prefix: 443, Founded in 2011. Ceased operations in 2013. | K | AVCODES |
| 3 | TSP | Transportes Aereos Inter | | | ICAO1 |
| 4 | TSP | TERMOELECTRICA SA - SUCURSALA TERMOSERV PAROSENI | | RO | VKM |
| 5 | TSPA | TRANSPORT ST-PAMPHILE INC | | | SCAC4 |
| 6 | TSPC | TRANSPORT SERGE POTVIN INC | | | SCAC4 |
| 7 | TSPE | TRIPLE S PETROLEUM CO | | | SCAC4 |
| 8 | TSPK | TOLEDO SECURITY PACKAGE | | | SCAC4 |
| 9 | TSPM | TRANSPORTES MATA | | | SCAC4 |
| 10 | TSPN | TRANSPETROL MARITIME SERVICES LTD | | | SCAC4 |
| 11 | TSPP | TRANSPORTES PONY EXPRESS | | | SCAC4 |
| 12 | TSPR | T & S TRANSPORT | | | SCAC4 |
| 13 | TSPT | TRANSPORT BGS | | | SCAC4 |
| 14 | TSPU | PARATORI S.P.A. | | I | BIC |
| 15 | TSPV | TRANSPORTES ARGUELLES | | | SCAC4 |
| 16 | TSPW | TRANSIT PLANNERS INC | | | SCAC4 |
| 17 | TSPX | Service Oil Refining Co. | 8/1920 | | NAKINA |
| 18 | TSPX | Texas Sulphur Products Co., Inc. | added 4/1977; eliminated 4/1979 | | NAKINA |
| 19 | TSPX | Texas Sulphur Products Co. | added 4/1979; 1/1980; eliminated 7/1985 | | NAKINA |
| 20 | TSPX | Newmont Nevada Energy Investment LLC | added 10/2007 | | NAKINA |
| 21 | TSPX | Texas Sulphur Products Co., Inc. | eliminated 4/79 | | NRHS |
| 22 | TSPX | Texas Sulphur Products Co. | added 4/79; 1/80 | | NRHS |
| 23 | TSPX | *TEXAS SULPHUR PRODUCTS COMPANY | | | PWRC |
| 24 | TSPX | +NEWMONT NEVADA ENERGY INVESTMENT, LLC | | | PWRC |
| 25 | TSPX | Texas Sulphur Products | | | RSRV |
| 26 | TSPX | NEWMONT NEVADA ENERGY INVESTMENT LL | | | SCAC4 |
| 27 | TSPY | TRADING STAMP PRINTERS AND SUPPLY C | | | SCAC4 |
| 28 | TSPZ | TRANSAMERICA LEASING INCORPORATED | | | PWRC |
| 29 | TSPZ | TAL International (BNSF Railway) | | | RSRV |
| 30 | TSPZ | TRANSAMERICA LEASING INC | | | SCAC4 |
