| 1 | TP | Transportes Aereos Portugueses, E.P. | ICAO: TAP, Callsign: Air Portugal, IATA Prefix: 047, Name changed to TAP - Air Portugal | P | AVCODES |
| 2 | TP | TAP Portugal | ICAO: TAP, Callsign: Air Portugal, IATA Prefix: 047, Name changed from TAP - Air Portugal | P | AVCODES |
| 3 | TP | Texas & Pacific Ry. Co. | 10/1957-1/1975; eliminated 1/1977 | | NAKINA |
| 4 | TP | Missouri Pacific R.R. Co. | 1/1980 | | NAKINA |
| 5 | TP | Missouri Pacific System | added 1/1977; 1/1994; eliminated 4/1997 | | NAKINA |
| 6 | TP | Union Pacific R.R. Co. | added 4/1997; 7/2000-7/2005 | | NAKINA |
| 7 | TP | Texas & Pacific Ry. Co. | 10/57-1/75; eliminated 1/77 | | NRHS |
| 8 | TP | Missouri Pacific R.R. Co. | Jan-80 | | NRHS |
| 9 | TP | Missouri Pacific System | added 1/77; 1/94; eliminated 4/97 | | NRHS |
| 10 | TP | Union Pacific R.R. Co. | added 4/97; 7/2000 | | NRHS |
| 11 | TP | UNION PACIFIC [MISSOURI PACIFIC; TEXAS & PACIFIC RY] | | | PWRC |
| 12 | TP | Texas and Pacific Railway (Union Pacific Railroad) | | | RSRV |
| 13 | TP | UNION PACIFIC RAILROAD COMPANY | | | SCAC4 |
| 14 | TP | Texas Pacific | | USA | TRAFFIC |
| 15 | TP&W | Toledo, Peoria & Western Ry. Co. | 8/1920-7/1923 | | NAKINA |
| 16 | TP&W | Toledo, Peoria & Western R.R. | 7/1930-4/1970 | | NAKINA |
| 17 | TP&W | Toledo, Peoria & Western R.R. | 4/38-4/70 | | NRHS |
| 18 | TP&W | TOLEDO, PEORIA & WESTERN RWY | | | PWRC |
| 19 | TP1 | TransPng 1 | | | TRAFFIC |
| 20 | TP2 | TransPng 2 | | | TRAFFIC |
| 21 | TPA | Transportes Aereos Mercantiles Panamericanos S.A., (TAMPA) | IATA: QT, Callsign: Tampa, IATA Prefix: 729, Name changed to Transportes Aereos Mercantiles Panamericanos S.A., (TAMPA) t/a Avianca Cargo w.e.f. 28 May 2013. | CO | AVCODES |
| 22 | TPA | Transportes Aereos Mercantiles Panamericanos S.A., (TAMPA) t/a Avianca Cargo | IATA: QT, Callsign: Tampa, IATA Prefix: 729, Name changed from Transportes Aereos Mercantiles Panamericanos S.A., (TAMPA) w.e.f. 28 May 2013. | CO | AVCODES |
| 23 | TPA | TAMPA | IATA: QT | | ICAO1 |
| 24 | TPAA | TARTAN PHEASANTRY | | | SCAC4 |
| 25 | TPAB | TRANSPORT A B SERA INC | | | SCAC4 |
| 26 | TPAD | TRANSPORT PATRICK ALARCON INC | | | SCAC4 |
| 27 | TPAE | TRANSPORTES PARUSA S A DE C V | | | SCAC4 |
| 28 | TPAF | TRANSPORT P A B BOUFFARD | | | SCAC4 |
| 29 | TPAH | TRANSPORT PLUS, INC | | | SCAC1 |
| 30 | TPAH | TRANSPORT PLUS INC | | | SCAC4 |
| 31 | TPAI | THOMAS, PHIL TRUCKING | | | SCAC4 |
| 32 | TPAJ | TEXPRESS PACKAGES | | | SCAC4 |
| 33 | TPAL | TRANSPORTES ALANIS | | | SCAC4 |
| 34 | TPAQ | TOPSAIL INC | | | SCAC4 |
| 35 | TPAR | TRANSPORTES ARTURO MONTEVERDE SA DE | | | SCAC4 |
| 36 | TPAS | TRANSPORT ANT-PASS LTEE | | | SCAC4 |
| 37 | TPAT | TRANSPORT PATENAUDE INC | | | SCAC4 |
| 38 | TPAV | TRANSPORTES ANROVA | | | SCAC4 |
| 39 | TPAX | Trans Pacific Leasing Inc. | added 1/1970; 4/1970-1/1975; eliminated 7/1976 | | NAKINA |
| 40 | TPAX | Trans Pacific Leasing Inc. | added 1/70; 4/70-1/75; eliminated 7/76 | | NRHS |
| 41 | TPAX | TRANS PACIFIC LEASING INC. | | | PWRC |
| 42 | TPAX | TTX COMPANY | | | SCAC4 |
| 43 | TPB | Aero Tropical, Lda | Callsign: Aero Tropical, | ANG | AVCODES |
| 44 | TPB | Aero Tropical | | | ICAO1 |
| 45 | TPB | Transporto Pubblico del Bellinzonese | City: Bellinzona | CH | TRAFFIC |
| 46 | TPBA | TRANSPORTES BERNAL | | | SCAC4 |
| 47 | TPBD | TP TRUCKING (BROKERAGE DIVISION) | | | SCAC4 |
| 48 | TPBE | TRANSPORT BERNIERES INC | | | SCAC4 |
| 49 | TPBF | T P L R HONEY FARMS | | | SCAC4 |
| 50 | TPBG | TORRE PEREZ, AGUSTIN | | | SCAC4 |
| 51 | TPBI | Transports publics biennois / Verkehrsbetriebe Biel | Real: tpb | CH | TRAFFIC |
| 52 | TPBL | TRANSPORT PIERRE BOLDUC INC | | | SCAC4 |
| 53 | TPBM | TRANSPORT BERTRAND MATHIEU INC | | | SCAC4 |
| 54 | TPBN | TRIPLE B TRUCKING LLC | | | SCAC4 |
| 55 | TPBP | TRIPLE B CORPORATION | | | SCAC4 |
| 56 | TPBQ | TRANSPORT BHOPAL | | | SCAC4 |
| 57 | TPBR | TRANSPORT BROKERS INC | | | SCAC4 |
| 58 | TPBS | TRACKSIDE PERFORMANCE LLC | | | SCAC4 |
| 59 | TPBUS | Komunikacja Gminy Tarnowo Podgórne "TPBUS" sp. z o.o. | City: Tarnowo Podgórne | PL | TRAFFIC |
| 60 | TPBX | General American Transportation Corp. | added 4/1970; 1/1975-1/1980; eliminated 10/1992 | | NAKINA |
| 61 | TPBX | General American Transportation Corp. | added 4/70; 1/75-1/80; eliminated 10/92 | | NRHS |
| 62 | TPBX | (GATX) RETIRED 08-19-92 ATP (1790) [TEXACO INC. - LESSEE] | | | PWRC |
| 63 | TPBX | General American Transportation Corporation (GATX) | | | RSRV |
| 64 | TPC | Air Caledonie | IATA: TY, Callsign: Aircal, IATA Prefix: 190, Designator TY reinstated by IATA | NC | AVCODES |
| 65 | TPC | Air Calédonie | IATA: TY | | ICAO1 |
| 66 | TPC | Transports Publics du Chablais | | CH | TRAFFIC |
| 67 | TPC | Transports Publics du Chablais SA | | CH | VKM |
| 68 | TPCA | TRIPLE C HAULING | | | SCAC4 |
| 69 | TPCC | TPC KOREA CO LTD | | | SCAC4 |
| 70 | TPCD | TOP CROP APPLICATORS INC | | | SCAC4 |
| 71 | TPCF | EPIC EXPRESS, A Division of Transport CFQI, INC | | | SCAC1 |
| 72 | TPCF | TRANSPORT CAR-FRE LTEE | | | SCAC4 |
| 73 | TPCF | TPCF, Train du Pays Cathare et du Fenouillèdes | | FR | VKM |
| 74 | TPCG | TOKIWA, PAUL CARTAGE LIMITED | | | SCAC4 |
| 75 | TPCI | TRANSCORP CARRIERS INC | | | SCAC4 |
| 76 | TPCL | TROPIC OIL COMPANY | | | SCAC4 |
| 77 | TPCN | TRANSPORT CONTINENTAL INC | | | SCAC4 |
| 78 | TPCO | TRANSPORT CONTINENTAL | | | SCAC4 |
| 79 | TPCP | TRANSPORTES CAMPOS | | | SCAC4 |
| 80 | TPCQ | TRANSPORT PATT CHABOT | | | SCAC4 |
| 81 | TPCR | TRIPLE C TRANSPORTATION | | | SCAC4 |
| 82 | TPCS | TRANS-PACIFIC LINES, LTD. | | | SCAC1 |
| 83 | TPCU | WAN HAI LINES LTD | | RC | BIC |
| 84 | TPCU | TRANSPACIFIC LINES | | | SCAC4 |
| 85 | TPCW | TRANSPRO COURIER INCORPORATED | | | SCAC4 |
| 86 | TPCX | The Palmolive Co. | 8/1920-7/1932 | | NAKINA |
| 87 | TPCX | The Palmolive Co. (Colgate-Palmolive-Peet Co.) | 7/1935 | | NAKINA |
| 88 | TPCX | Colgate-Palmolive-Peet Co. | 7/1937-1/1952; eliminated 1/1953 | | NAKINA |
| 89 | TPCX | Taylor-Colquitt Co. | eliminated 1/1961 | | NAKINA |
| 90 | TPCX | The Purdy Co. | added 7/1972; 1/1975-1/1980; eliminated 1/1990 | | NAKINA |
| 91 | TPCX | Colgate-Palmolive-Peet Co. | 4/38-1/52; eliminated 1/53 | | NRHS |
| 92 | TPCX | The Purdy Co. | 1/75-1/80; eliminated 1/90 | | NRHS |
| 93 | TPCX | *COLGATE-PALMOLIVE-PEET CO. | | | PWRC |
| 94 | TPCX | *TAYLOR-COLQUITT CO. | | | PWRC |
| 95 | TPCX | *PURDY CO. | | | PWRC |
| 96 | TPCX | The Purdy Co. (Trademark Plastics Corp) | | | RSRV |
| 97 | TPCX | TRADEMARK PLASYICS CORPORATION | | | SCAC4 |
| 98 | TPCY | TRANS-PORC GUY LEDUC INC | | | SCAC4 |
| 99 | TPCZ | TIPHOOK CONTAINER RENTAL COMPANY LIMITED | | | PWRC |
| 100 | TPCZ | Tiphook Container Rental Limited | | | RSRV |
