| 1 | GZ | Air Rarotonga | | COK | AVCODES |
| 2 | GZ | Sakhalinskie Aviatrassy SAT | ICAO: SHU, IATA designator changed to HZ. Designator GZ* reinstated by IATA | RUS | AVCODES |
| 3 | GZ | Air Intergulf Ltd. | | UAE | AVCODES |
| 4 | GZ | Gregory Air Services Ltd. | Callsign: Gragair, | GB | AVCODES |
| 5 | GZ | Aerogulf Services Company | Callsign: Aerogulf, | UAE | AVCODES |
| 6 | GZ | GENEVA ELEVATOR | | | PWRC |
| 7 | GZA | Excellent Air GmbH | Callsign: Excellent Air, Founded in 1969 as Frontier Air Service. Ceased operations in 2007. Name changed from Grenzland Air Service and ICAO callsign changed from Grenzland | D | AVCODES |
| 8 | GZA | Grenzland Air Service | Callsign: Grenzland, Name and ICAO callsign changed | D | AVCODES |
| 9 | GZA | Excellent Air | | | ICAO1 |
| 10 | GZAA | GONZALEZ ASTORGA, ALFONSO | | | SCAC4 |
| 11 | GZAI | GOOD ZONE AUTO INC | | | SCAC4 |
| 12 | GZAJ | GARZA AMAYA, JESUS MOISES | | | SCAC4 |
| 13 | GZBG | GOMEZ BROTHERS TRUCKING | | | SCAC4 |
| 14 | GZBT | GOMEZ BROTHERS TRUCKING | | | SCAC4 |
| 15 | GZCDC | Generálne zastúpenie ČD Cargo, s.r.o. | | SK | VKM |
| 16 | GZCM | GONZALEZ CRUZ, MARIA LUISA ICELA | | | SCAC4 |
| 17 | GZCO | GOMEZ CORONA, JOSE CARMEN | | | SCAC4 |
| 18 | GZCU | GAZCORP S.A. | | P | BIC |
| 19 | GZD | V. Grizodubova Air Company Ltd. | IATA: G4, Callsign: Grizodubova Air, IATA Prefix: 934, Name changed from Air Company Elf-Air | RUS | AVCODES |
| 20 | GZD | Grizodubova Air Company | | | ICAO1 |
| 21 | GZDJ | GOTZ, DANIEL J | | | SCAC4 |
| 22 | GZDM | GOMEZ DE MARTINEZ, ESPERANZA | | | SCAC4 |
| 23 | GZDS | GLAZERS DISTRIBUTORS | | | SCAC4 |
| 24 | GZER | GRUZ EXPRESS LLC | | | SCAC4 |
| 25 | GZET | GONZALES TRUCKING | | | SCAC4 |
| 26 | GZEU | GAZECHIM FROID | | F | BIC |
| 27 | GZEU | GAZECHIM FROID | | | SCAC4 |
| 28 | GZFR | GREWALZ FAST TRACK TRUCKING INC | | | SCAC4 |
| 29 | GZGU | INFRAPRO LLC | | RUS | BIC |
| 30 | GZJO | GONZALEZ, JOSE O | | | SCAC4 |
| 31 | GZKI | GRASZER TRUCKING INC | | | SCAC4 |
| 32 | GZLE | GONZALEZ LOPEZ, ELISEO | | | SCAC4 |
| 33 | GZLY | GODINEZ TRUCKING | | | SCAC4 |
| 34 | GZME | GARZA DE LEON, DIANA ELIZABETH | | | SCAC4 |
| 35 | GZMI | GONZALEZ, MARCO ANTONIO | | | SCAC4 |
| 36 | GZMO | GONZALEZ, MARIO A | | | SCAC4 |
| 37 | GZMS | GONZALES, MICHAEL STEVEN TRUCKING C | | | SCAC4 |
| 38 | GZMT | GUZMAN TRUCKING | | | SCAC4 |
| 39 | GZNFP | Gdańskie Zakłady Nawozów Fosforowych FOSFORY Sp. z o.o. | | PL | VKM |
| 40 | GZP | Gazpromavia Aviation Company Limited | IATA: 4G, Callsign: Gazprom, Founded in 1995 | RUS | AVCODES |
| 41 | GZP | Gazpromavia | IATA: 4G | | ICAO1 |
| 42 | GZQ | Zagros Air | IATA: Z4, IATA Prefix: 541, Name changed to Zagrosjet Airlines in Augsut 2013. Affiliate of Atlasjet Turkey | IRQ | AVCODES |
| 43 | GZQ | Zagrosjet Airlines | IATA: Z4, IATA Prefix: 541, Ceased operations during March 2018. Name changed to Zagros Air in August 2013. Affiliate of Atlasjet Turkey | IRQ | AVCODES |
| 44 | GZR | Aeromanagement Group | Callsign: Gezira, | USA | AVCODES |
| 45 | GZRA | GAR-ZA TRANSFER | | | SCAC4 |
| 46 | GZRB | GONZALEZ RAMIREZ, RUBEN | | | SCAC4 |
| 47 | GZRC | GLEZCO TRS INC | | | SCAC4 |
| 48 | GZRD | GONZALEZ RODRIGUEZ, GUADALUPE | | | SCAC4 |
| 49 | GZRN | GARZA, RENE | | | SCAC4 |
| 50 | GZRS | GIRLETZ RODEO STOCK | | | SCAC4 |
| 51 | GZSM | GARZA, SANTANA MIGUEL | | | SCAC4 |
| 52 | GZT | Gorizont Air | Callsign: Gorizont Air, | AM | AVCODES |
| 53 | GZTN | GONZALEZ TRUCKING | | | SCAC4 |
| 54 | GZTU | GAZETEC INDUSTRIES S A L | | | SCAC4 |
| 55 | GZXN | GONZ TRANSPORTATION | | | SCAC4 |
| 56 | GZYD | GORZNY, DAVID TRUCKING INC | | | SCAC4 |
