| 1 | TQ | Tandem Aero Ltd. | ICAO: TDM, Callsign: Tandem, IATA Prefix: 038, Designator TQ reinstated by IATA. Ceased operations in April 2019. | MD | AVCODES |
| 2 | TQ | Transwede Airways AB | ICAO: TWE, Transwede Airways merged into Braathens. Transwede Leisure merged in Blue Scandinavia during 1998. | S | AVCODES |
| 3 | TQ | Tradair Ltd. | Callsign: Tradair, | GB | AVCODES |
| 4 | TQ | Tailwind Air, LLC | ICAO: PGN, Callsign: Pergrine, Name changed from Volo Aviation, LLC. | USA | AVCODES |
| 5 | TQAB | TORTILLAS SABINAS | | | SCAC4 |
| 6 | TQAC | TRANSPORTES QUEZADA | | | SCAC4 |
| 7 | TQAE | TOTAL QUALITY ASSURANCE LLC | | | SCAC4 |
| 8 | TQAG | TRANSPORT AG | | | SCAC4 |
| 9 | TQAH | TRANS AM FREIGHT | | | SCAC4 |
| 10 | TQAI | TFS LOGISTICS USA INC | | | SCAC4 |
| 11 | TQAM | TRANS-AM SEA FREIGHT (HK) LTD | | | SCAC4 |
| 12 | TQAS | TRASA | | | SCAC4 |
| 13 | TQAV | TRANS-QUEBEC AUDIO VISUEL | | | SCAC4 |
| 14 | TQB | Tobruk Air Transport and Cargo | IATA: 7T, Callsign: Tobruk Air, | LAR | AVCODES |
| 15 | TQBD | TRANSQUIMICA BINACIONAL SA DE CV | | | SCAC4 |
| 16 | TQBE | TRANSPORT QUEBEC-AM INC | | | SCAC4 |
| 17 | TQBL | TRANSPORT COULOMBE | | | SCAC4 |
| 18 | TQCE | TRANSPORT CIRCUIT EXPRESS INC | | | SCAC4 |
| 19 | TQCG | TRAILCON LOGISTICS LLC | | | SCAC4 |
| 20 | TQCM | TRANSPORT CARL MAHEUX | | | SCAC4 |
| 21 | TQDA | THOMPSON, DALE | | | SCAC4 |
| 22 | TQDF | TRANSCORR LLC (DEDICATED FLEET) | | | SCAC4 |
| 23 | TQDR | TRANSPORTES RORO SA DE CV | | | SCAC4 |
| 24 | TQDS | TRANSPORT DANY JACQUES ENR | | | SCAC4 |
| 25 | TQDU | CHONGQING TONGQU SPECIAL VEHICLE MANUFACTURING CO.,LTD. | | PRC | BIC |
| 26 | TQE | Taxair Mexiquenses, S.A. De C.V. | Callsign: Taxair, | MEX | AVCODES |
| 27 | TQEP | TRIANGLE FAITH S A | | | SCAC4 |
| 28 | TQER | TRANSPORTES ESPECIALIZADOS RUIZ | | | SCAC4 |
| 29 | TQEX | U.S. Rail Services | added 7/1989; 1/1994; eliminated 4/1994 | | NAKINA |
| 30 | TQEX | USL Capital Rail Services | added 4/1994; eliminated 10/1996 | | NAKINA |
| 31 | TQEX | First Union Rail | added 10/1996; 7/2000-7/2005 | | NAKINA |
| 32 | TQEX | U.S. Rail Services | added 7/89; 1/94; eliminated 4/94 | | NRHS |
| 33 | TQEX | USL Capital Rail Services | added 4/94; eliminated 10/96 | | NRHS |
| 34 | TQEX | First Union Rail | added 10/96; 7/2000 | | NRHS |
| 35 | TQEX | FIRST UNION RAIL [(RUSX) USL CAPITAL RAIL SERVICES] | | | PWRC |
| 36 | TQEX | First Union Rail | | | RSRV |
| 37 | TQF | UK Royal VIP Helicopter Flights | Callsign: Rainbow, ICAO designator changed to TKF. | GB | AVCODES |
| 38 | TQF | United Kingdom Royal VIP Flights | | | ICAO1 |
| 39 | TQFL | TRANSPORTES ESPECIALIZADOS SAN RAFA | | | SCAC4 |
| 40 | TQFM | T & T FARM | | | SCAC4 |
| 41 | TQFR | TRANSFREIGHT LLC | | | SCAC4 |
| 42 | TQFS | TRIPLE J FARMS | | | SCAC4 |
| 43 | TQGC | TRANSPORTS REGI INC | | | SCAC4 |
| 44 | TQGE | TRANSPORTES GEES | | | SCAC4 |
| 45 | TQGI | TIME LOGISTICS INC | | | SCAC4 |
| 46 | TQGL | TRANSPORT ROGER OUELLET INC | | | SCAC4 |
| 47 | TQHC | TRANSCHEMICAL INCORPORATED | | | SCAC4 |
| 48 | TQIO | TEAM TRANSPORTATION INC | | | SCAC4 |
| 49 | TQJB | TJB | | | SCAC4 |
| 50 | TQJC | TSJ CONSOLIDATORS INC | | | SCAC4 |
| 51 | TQJL | TRANSPORT JACQUES LEGAULT & FILS IN | | | SCAC4 |
| 52 | TQKC | TUTLE LIQUID TANK LLC | | | SCAC4 |
| 53 | TQLC | T & T SALES INC | | | SCAC4 |
| 54 | TQLF | TOTAL TRANSFER | | | SCAC4 |
| 55 | TQLL | TQ LOGISTICS | | | SCAC4 |
| 56 | TQLO | TRANSTATE LOGISTICS INC | | | SCAC4 |
| 57 | TQLS | TRS LOGISTICS INC | | | SCAC4 |
| 58 | TQLT | TRIPLE T TRUCKING INC | | | SCAC4 |
| 59 | TQLV | TOTAL QUALITY LOGISTICS SERVICES IN | | | SCAC4 |
| 60 | TQLY | TRADE LOGISTICS CORPORATION | | | SCAC4 |
| 61 | TQM | JM Family Aviation | Callsign: Tacoma, ICAO designator changed to TKM | USA | AVCODES |
| 62 | TQM | JM Family Aviation | | | ICAO1 |
| 63 | TQMB | TRANSPORTES JMB | | | SCAC4 |
| 64 | TQMD | TRANSPORTES MENDOZA | | | SCAC4 |
| 65 | TQME | TIMM ENTERPRISES LIMITED | | | SCAC4 |
| 66 | TQMG | TOTAL METAL RECYCLING INC | | | SCAC4 |
| 67 | TQMH | TRANSOUTH MOTORCOACH LLC | | | SCAC4 |
| 68 | TQMM | TMM CAR CARRIERS S A DE CV | | | SCAC4 |
| 69 | TQMR | TRANSPORT MTR | | | SCAC4 |
| 70 | TQMS | TOMASSO BROS | | | SCAC4 |
| 71 | TQMU | INTERMODAL TANK TRANSPORT INC. | | USA | BIC |
| 72 | TQMU | Intermodal Tank Transport | | | RSRV |
| 73 | TQMU | INTERMODAL TANK TRANSPORT INC | | | SCAC4 |
| 74 | TQMV | TRANSPORTES MON-RO S A DE C V | | | SCAC4 |
| 75 | TQMX | THOR QUIMICOS DE MEXICO SA DE CV | | | PWRC |
| 76 | TQMX | THOR QUIMICOS DE MEXICO S A DE C V | | | SCAC4 |
| 77 | TQN | Taquan Air Services, Inc. | IATA: K3, Callsign: Taquan, Designator K3* recalled by IATA | USA | AVCODES |
| 78 | TQN | Venture Travel, LLC. t/a Taquan Air | IATA: K3, Callsign: Taquan, Designator K3* reinstated by IATA. IATA designator changed from H7* | USA | AVCODES |
| 79 | TQN | Taquan Air Services | | | ICAO1 |
| 80 | TQNC | TARNEL USA INC | | | SCAC4 |
| 81 | TQNE | TRANSEC INTERNATIONAL INC USA | | | SCAC4 |
| 82 | TQNM | TRANSPORTES INTERNACIONALES MEDRANO | | | SCAC4 |
| 83 | TQNN | TRANS-OSCAR INC | | | SCAC4 |
| 84 | TQNP | TRAILER NET TRANSPORT | | | SCAC4 |
| 85 | TQNT | TNT TRUCKING | | | SCAC4 |
| 86 | TQOC | TANNCO TRANSPORT INC | | | SCAC4 |
| 87 | TQOI | TRIANGLE OIL CO | | | SCAC4 |
| 88 | TQOM | TORMART | | | SCAC4 |
| 89 | TQPD | TRANSPUENTES 3 POLOS SA DE CV | | | SCAC4 |
| 90 | TQPH | TRANSPORTES APACHE | | | SCAC4 |
| 91 | TQPM | TRIBAL PETROLEUM SUPPLIERS | | | SCAC4 |
| 92 | TQPN | TIP TIPTON | | | SCAC4 |
| 93 | TQPP | THERMO PETROLEUM PRODUCTS INC | | | SCAC4 |
| 94 | TQPR | TPR TRUCKING INC | | | SCAC4 |
| 95 | TQPS | TRIPPS, LLC | | | SCAC4 |
| 96 | TQPY | TRANSPORT D Y INC | | | SCAC4 |
| 97 | TQQ | Tarco Aviation Company Limited | IATA: 3T, Callsign: Aviation Tarco, Established in 2009. Name changed from Tarco Air. ICAO desigantor changed from TRQ. ICAO callsign changed from Airtarco. | SUD | AVCODES |
| 98 | TQR | Transportacion Aerea de Queretaro, S.A. de C.V. | Callsign: Transqueretaro, | MEX | AVCODES |
| 99 | TQR | Transportacion Aerea De Queretaro | | | ICAO1 |
| 100 | TQRB | TEMPLE, ROBERT | | | SCAC4 |
