| 1 | TZ | American Trans Air, Inc. | ICAO: AMT, Callsign: AmTran, IATA Prefix: 366, Name changed to ATA Airlines, Inc. d/b/a ATA w.e.f. 19 March 2003. IATA Designator changed from 3T | USA | AVCODES |
| 2 | TZ | Transair Limited | ICAO: TTZ, Callsign: Transair, Formed by the merger of Central Northern Airways and Arctic Wings in 1956. Merged into Pacific Western Airlines on 01 November 1979. | CDN | AVCODES |
| 3 | TZ | ATA Airlines, Inc. d/b/a ATA | ICAO: AMT, Callsign: AmTran, IATA Prefix: 366, Ceased Operations on 02 April 2008. Name changed from American Trans Air, Inc. w.e.f. 19 March 2003. | USA | AVCODES |
| 4 | TZ | Air-Taxi Europe (a-te) GmbH | ICAO: TWG, Callsign: Twin-Goose, | D | AVCODES |
| 5 | TZ | Scoot Private Ltd | ICAO: SCO, Callsign: Scooter, IATA Prefix: 668, Name changed to Scoot Tigerair Pte. Ltd. (Merged with Tigerair.). IATA Designator changed from OQ w.e.f. 14 May 2012. | SGP | AVCODES |
| 6 | TZ | Tsaradia | ICAO: TDS, Callsign: Tsaradia, IATA Prefix: 852, Domestic subsidary of Air Madagascar | RM | AVCODES |
| 7 | TZ | TŘINECKÉ ŽELEZÁRNY, a.s. | | CZ | VKM |
| 8 | TZA | Aeronaves Azteca, S.A. de C.V. | Callsign: Aeronaves Azteca, | MEX | AVCODES |
| 9 | TZA | Aero Tomza, S.A. de C.V. | Callsign: Aero Tomza, | MEX | AVCODES |
| 10 | TZA | Aero Tomza | | | ICAO1 |
| 11 | TZAA | TRANSPORTES ZAARA | | | SCAC4 |
| 12 | TZAD | TRANSPORTES ZADABY | | | SCAC4 |
| 13 | TZAF | Tanzanian Air Force | | EAT | TRAFFIC |
| 14 | TZAM | TRANSPORTADORA ZAM | | | SCAC4 |
| 15 | TZAN | TRANSCOZIA INC | | | SCAC4 |
| 16 | TZAQ | TERROZA EXPLORATION SERVICES INC | | | SCAC4 |
| 17 | TZAR | TRANSPORTES ZARAZUA | | | SCAC4 |
| 18 | TZAT | TRANSPORTES ZARATE | | | SCAC4 |
| 19 | TZB | Traditionszug Berlin e.V. | Berlin | D | privat-bahn.de |
| 20 | TZB | Traditionszug Berlin e.V. | | DE | VKM |
| 21 | TZCL | T-Z CARGO LTD | | | SCAC4 |
| 22 | TZDU | TAJIKISTAN RAILWAY | | | SCAC4 |
| 23 | TZE | Transporte Aereo Ernesto Saenz, S.A. de C.V. | Callsign: Transporte Saenz, | MEX | AVCODES |
| 24 | TZE | Transporte Aereo Ernesto Saenz | | | ICAO1 |
| 25 | TZEA | TRANSPORT ZEPEDA | | | SCAC4 |
| 26 | TZEC | TRZAC XPRESS INC | | | SCAC4 |
| 27 | TZEI | TRANSPORTES ZULETA EXPRESS INC | | | SCAC4 |
| 28 | TZES | TWO ZERO ONE TWO NINE THREE ONE (20 | | | SCAC4 |
| 29 | TZFF | THREE ZERO FIVE FOUR ZERO SIX THREE | | | SCAC4 |
| 30 | TZFI | TWO ZERO FOUR SIX TWO FIVE TWO (204 | | | SCAC4 |
| 31 | TZFN | TWO ZERO FIVE EIGHT NINE SEVEN EIGH | | | SCAC4 |
| 32 | TZFQ | TWO ZERO FIVE SEVEN ONE SIX SIX (20 | | | SCAC4 |
| 33 | TZFR | TWO ZERO FOUR ZERO SIX THREE NINE ( | | | SCAC4 |
| 34 | TZFS | TWO ZERO ONE FOUR SEVEN FIVE SIX (2 | | | SCAC4 |
| 35 | TZFV | TWO ZERO FIVE ZERO SEVEN FOUR TWO ( | | | SCAC4 |
| 36 | TZGA | TRANSPORTES ROZUGA | | | SCAC4 |
| 37 | TZIU | TCI-TAZAR CORP INTERNATIONAL LIMITED | | HK | BIC |
| 38 | TZJC | TRANSPORTES ESPINOZA | | | SCAC4 |
| 39 | TZK | Tajikistan Airlines | Callsign: Tajikistan, | TJ | AVCODES |
| 40 | TZK | Tajikstan | | | ICAO1 |
| 41 | TZKG | T Z TRUCKING INC | | | SCAC4 |
| 42 | TZKM | TOMASZEWSKI, MICHAL | | | SCAC4 |
| 43 | TZKU | SUMISEI TAIWAN TECHNOLOGY CO LTD | | RC | BIC |
| 44 | TZL | Tselina | Callsign: Zelin, | KZ | AVCODES |
| 45 | TZLG | TZENG LONG U S A INC | | | SCAC4 |
| 46 | TZLO | TRANSZACH LOGISTICS INC | | | SCAC4 |
| 47 | TZMD | TARZIAN MOVING AND DELIVERIES CORP | | | SCAC4 |
| 48 | TZMS | TRANZ MOBILE SERVICES INC | | | SCAC4 |
| 49 | TZNI | TERZIANO INC | | | SCAC4 |
| 50 | TZNQ | THREE ZERO NINE SIX-SEVEN ZERO EIGH | | | SCAC4 |
| 51 | TZOA | TWO ZERO ONE SEVEN THREE | | | SCAC4 |
| 52 | TZOC | TWO ZERO ONE SIX THREE TWO ZERO (20 | | | SCAC4 |
| 53 | TZOI | TWO ZERO ONE NINE ONE FIVE FOUR (20 | | | SCAC4 |
| 54 | TZOO | TWO ZERO ONE FOUR SIX NINE FOUR (20 | | | SCAC4 |
| 55 | TZOQ | TWO ZERO SIX FOUR FIVE TWO ONE (206 | | | SCAC4 |
| 56 | TZP | Aerotaxis de Atizapan | Callsign: Taxi Atizapan, | MEX | AVCODES |
| 57 | TZP | Zipair Tokyo, Inc. | IATA: ZG, Callsign: Zippy, LCC subsidary of Japan Airlines. Established on 08 March 2019. Due to commence operations in Summer 2020 with 787-8 aircraft. | J | AVCODES |
| 58 | TZPR | Tazewell & Peoria R.R. | added 1/2005; 7/2005 | | NAKINA |
| 59 | TZPR | TAZEWELL & PEORIA RAILROAD | | | PWRC |
| 60 | TZPR | Tazewell and Peoria Railroad | | | RSRV |
| 61 | TZPR | TAZEWELL & PEORIA RAILROAD INC | | | SCAC4 |
| 62 | TZR | Rainbow Air, C.A. | Callsign: Rain-Bee, | YV | AVCODES |
| 63 | TZRC | Tanzania Railways Corporation | Real: TRC | EAT | TRAFFIC |
| 64 | TZRG | TRANSPORTES ESPECIALIZADOS RG SA DE | | | SCAC4 |
| 65 | TZRL | TOZER LAKE TRUCKING | | | SCAC4 |
| 66 | TZRO | TRANSPORTES ZE-RO | | | SCAC4 |
| 67 | TZRU | TAZZETTI S.P.A. | | I | BIC |
| 68 | TZS | Aerotransportacion Azteca, S.A. de C.V. | Callsign: Azteca, | MEX | AVCODES |
| 69 | TZS | The Cargo Airlines | Callsign: Toka, Name changed to TCA Ltd. | GE | AVCODES |
| 70 | TZS | TCA LLC | IATA: N6, Callsign: Toka, Name changed from The Cargo Airlines. | GE | AVCODES |
| 71 | TZSD | TRANSPORTES ZUAZUA SA DE C V | | | SCAC4 |
| 72 | TZSK | THREE ZERO SEVEN (307) INC | | | SCAC4 |
| 73 | TZSQ | THREE ZERO SIX FIVE SEVEN SIX SIX ( | | | SCAC4 |
| 74 | TZSR | TRANZSTAR INC | | | SCAC4 |
| 75 | TZSS | TWO ZERO SIX THREE SIX NINE THREE ( | | | SCAC4 |
| 76 | TZT | Air Zambezi | IATA: ZT, Callsign: Zambezi, Designator ZT reinstated by IATA | ZW | AVCODES |
| 77 | TZT | Air Zambezi | IATA: ZT, Callsign: Zambezi, Designator ZT recalled by IATA | ZW | AVCODES |
| 78 | TZT | Air Zambezi | | | ICAO1 |
| 79 | TZTA | TWO ZERO THREE ZERO (2030) NATIONAL | | | SCAC4 |
| 80 | TZTE | TWO ZERO THREE ZERO FIVE FOUR SIX ( | | | SCAC4 |
| 81 | TZTI | TRANZACT TECHNOLOGIES | | | SCAC4 |
| 82 | TZTM | TWO ZERO THREE THREE SIX SIX NINE ( | | | SCAC4 |
| 83 | TZTN | TWO ZERO TWO NINE ONE EIGHT ONE (20 | | | SCAC4 |
| 84 | TZTR | TRANSPORT MIGUEL DOMINGUEZ INC | | | SCAC4 |
| 85 | TZTY | TY ZAC TRUCKING | | | SCAC4 |
| 86 | TZU | Servicios Aereos Tamazula, S.A. de C.V. | Callsign: Tamazula, | MEX | AVCODES |
| 87 | TZU | Servicios Aereos Tamazula | | | ICAO1 |
| 88 | TZVO | TRANS TREVIZO | | | SCAC4 |
| 89 | TZVZG | TŽV Gredelj d.o.o. | | HR | VKM |
| 90 | TZXL | TRIPOZ TRANSPORT LC | | | SCAC4 |
| 91 | TZXQ | TAZ EXPRESS, INC | | | SCAC1 |
| 92 | TZXQ | TAZ EXPRESS | | | SCAC4 |
| 93 | TZZN | THREE ZERO ZERO NINE FOUR THREE TWO | | | SCAC4 |
| 94 | TZZP | TWO ZERO ZERO FOUR (2004) PLAYER LO | | | SCAC4 |
