| 1 | TRF | Air Transafrik Limited | IATA: PQ, Callsign: Transafrik, Designator PQ recalled by IATA | GH | AVCODES |
| 2 | TRF | Taxi Air Fret | | F | AVCODES |
| 3 | TRF | Thrust Flight | Callsign: Thrust, | USA | AVCODES |
| 4 | TRF | Taxi Air Fret | | | ICAO1 |
| 5 | TRFB | TRANSPORTES REFRIGERADOS BALDENEBRO | | | SCAC4 |
| 6 | TRFD | TRANSPORTES REFRIGERA | | | SCAC4 |
| 7 | TRFF | TRANSPORTES REFRIGERADOS DE LA FRON | | | SCAC4 |
| 8 | TRFG | TRUST FREIGHT SERVICES INC | | | SCAC4 |
| 9 | TRFI | TRANSPORT R FLUET INC | | | SCAC4 |
| 10 | TRFK | TRAFIK SERVICES, INC | | | SCAC1 |
| 11 | TRFL | TRAFFIC INTERNATIONAL CORP | | | SCAC4 |
| 12 | TRFP | TRANSPORTES RAFAGAS DEL NORTE SA DE | | | SCAC4 |
| 13 | TRFQ | TRANSPORTES REFRIGERADOS QUIROZ | | | SCAC4 |
| 14 | TRFR | TRANS - AMERICAN FRT LINES INC | | | PWRC |
| 15 | TRFR | TRANSFER | | | SCAC4 |
| 16 | TRFSA | TRANSFESA (Transportes Ferroviarios Especiales S.A.) | | ES | VKM |
| 17 | TRFSR | TRANSFESA RAIL S.A.U. | | ES | VKM |
| 18 | TRFU | TRANS FREIGHT, INC | | | PWRC |
| 19 | TRFU | Trans Freight | | | RSRV |
| 20 | TRFU | TRANS FREIGHT LINES, INC. | | | SCAC4 |
| 21 | TRFW | TRAFFIC WORLD | | | SCAC4 |
| 22 | TRFX | Tiona Refining Co. | 8/1920-4/1938 | | NAKINA |
| 23 | TRFX | Turpentine & Rosin Factors, Inc. | 1/1943-10/1957; eliminated 1/1961 | | NAKINA |
| 24 | TRFX | Nelio Chemicals, Inc. | added 1/1961; 4/1961; eliminated 10/1964 | | NAKINA |
| 25 | TRFX | Tiona Refining Co. | Apr-38 | | NRHS |
| 26 | TRFX | Turpentine & Rosin Factors, Inc. | 1/52-10/57 | | NRHS |
| 27 | TRFX | Nelio Chemicals, Inc. | Apr-61 | | NRHS |
| 28 | TRFX | *TIONA REFINING CO. | | | PWRC |
| 29 | TRFX | *NELIO CHEMICALS, INC. [TURPENTINE & ROSIN FACTORS, INC.] | | | PWRC |
| 30 | TRFX | HESS CORPORATION | | | SCAC4 |
| 31 | TRFY | TRANSPORTES REFRIGERADOS UCEC SA DE | | | SCAC4 |
| 32 | TRFZ | TRANSCONTINENTAL REGRIGERATOR LINES, INC. | | | PWRC |
| 33 | TRFZ | Transcontinental Refrigerator Lines | | | RSRV |
| 34 | TRFZ | TRANSCONTINENTAL REFRIGERATOR LINES | | | SCAC4 |