| 1 | GI | Air Company Itek-Air Ltd. | ICAO: IKA, Callsign: Itek-Air, IATA Prefix: 420, Founded in 1999. Ceased operations in 2010. | KS | AVCODES |
| 2 | GI | Air Guinee | ICAO: GIB, Callsign: Guinee, Designator GI recalled by IATA | GUI | AVCODES |
| 3 | GI | Germania Express Fluggsesllschaft mbH | ICAO: GMQ, Callsign: Corgi, Formerly Flynext Fluggsesllschaft mbH | D | AVCODES |
| 4 | GI | Guangdong Longhao Airlines Co., Ltd. | ICAO: LHA, Callsign: Air Canton, Name changed to Zhongyuan Longhao Airlines Co., Ltd. Commenced operations on 29 March 2017. | PRC | AVCODES |
| 5 | GI | Zhongyuan Longhao Airlines Co., Ltd. | ICAO: LHA, Callsign: Air Canton, Name changed to China Central Longhao Airlines Co., Ltd. Name changed from Guangdong Longhao Airlines Co., Ltd. Commenced operations on 29 March 2017. | PRC | AVCODES |
| 6 | GI | China Central Airlines Co., Ltd. | ICAO: LHA, Callsign: Air Canton, Name changed from Zhongyuan Longhao Airlines Co., Ltd. and previously changed from Guangdong Longhao Airlines Co., Ltd. Commenced operations on 29 March 2017. | PRC | AVCODES |
| 7 | GIA | Garuda Indonesia | IATA: GA, Callsign: Indonesia, IATA Prefix: 126, Name changed from Garuda Indonesia Airways P.T. ICAO callsign changed from Garuda | RI | AVCODES |
| 8 | GIA | Garuda Indonesia Airways P.T. | IATA: GA, Callsign: Garuda, IATA Prefix: 126, Name changed to Garuda Indonesia. ICAO callsign changed to Indonesia | RI | AVCODES |
| 9 | GIA | Garuda Indonesia | IATA: GA | | ICAO1 |
| 10 | GIA | Penerbangan Garuda Indonesia | | RI | TRAFFIC |
| 11 | GIAC | GIACCO | | | SCAC4 |
| 12 | GIAF | GILBERTSON TRUCKING | | | SCAC4 |
| 13 | GIAG | GLEN ISLE AGRI-SERVICES INC | | | SCAC4 |
| 14 | GIAH | GALLERIA TRANSPORTATION LTD | | | SCAC4 |
| 15 | GIAK | GILA TRUCKING LLC | | | SCAC4 |
| 16 | GIAR | GILLAN TRUCKING CO LTD | | | SCAC4 |
| 17 | GIAV | GRUPO INTERNACIONA | | | SCAC4 |
| 18 | GIB | Air Guinee | Callsign: Air Guinee, | GUI | AVCODES |
| 19 | GIB | Air Guinee | IATA: GI, Callsign: Guinee, Designator GI recalled by IATA | GUI | AVCODES |
| 20 | GIB | GR Air | Callsign: Gravia, | GUI | AVCODES |
| 21 | GIB | GR-Avia | | | ICAO1 |
| 22 | GIBE | GIBBENS & LEFORT INC | | | SCAC4 |
| 23 | GIBF | GIBBONS, RANDY | | | SCAC4 |
| 24 | GIBJ | GIBBS, JOE RACING INC | | | SCAC4 |
| 25 | GIBP | GIBSON, P R CONTRACT CARRIERS INC | | | SCAC4 |
| 26 | GIC | Compagnie de Bauxites de Guinee | Callsign: Cebege, | GUI | AVCODES |
| 27 | GIC | Compagnie de Bauxites de Guinee | | | ICAO1 |
| 28 | GICI | GIBSON INTERNATIONAL CARRIERS INC | | | SCAC4 |
| 29 | GICL | GORGONIA DI NAVIGAZIONE SRL | | | SCAC4 |
| 30 | GICN | GARDEN ISLE COURIER INC | | | SCAC4 |
| 31 | GICO | GOLD, I CORP | | | SCAC4 |
| 32 | GICP | GUARDIAN INDUSTRIES CANADA CORP | | | SCAC4 |
| 33 | GICQ | GARCIA, RAYMUNDO | | | SCAC4 |
| 34 | GICU | EMPRESA DE GASES INDUSTRIALES | | C | BIC |
| 35 | GICU | EMPRESA DE GASES INDUSTRIALES | | | SCAC4 |
| 36 | GICX | Gateway Investment Co. | added 7/1966; 10/1966; eliminated 7/1967 | | NAKINA |
| 37 | GICX | Gateway Investment Co. | added 7/66; 10/66; eliminated 7/67 | | NRHS |
| 38 | GICX | GATEWAY INVESTMENT CO. | | | PWRC |
| 39 | GICZ | GIBSON CO-OP | | | PWRC |
| 40 | GID | Sud Air Transport, S.A. | Callsign: Sud Transport, | GUI | AVCODES |
| 41 | GID | Grupo Integracion Comercializacion y Servicios, S.A. de C.V. | Callsign: Intecom, | MEX | AVCODES |
| 42 | GIDA | GILDIA | | | SCAC4 |
| 43 | GIDB | GILL, D BLAINE | | | SCAC4 |
| 44 | GIDF | GET IT DONE FREIGHT BROKERS LLC | | | SCAC4 |
| 45 | GIDP | GET-IT-DONE TRANSPORT | | | SCAC4 |
| 46 | GIDR | G I DRAYAGE INC | | | SCAC4 |
| 47 | GIDT | GID LOGISTICS | | | SCAC4 |
| 48 | GIE | Guinee Inter Air | Callsign: Guinee Inter, | GUI | AVCODES |
| 49 | GIE | Elysian Airlines | Designator E4 recalled by IATA | GUI | AVCODES |
| 50 | GIEC | GERIC IMPORT/EXPORT SERVICES | | | SCAC4 |
| 51 | GIEE | GIERE TRUCKING INC | | | SCAC4 |
| 52 | GIEO | GLOBO INPORT EXPORT | | | SCAC4 |
| 53 | GIEP | GIELOW LOGISTICS LLC | | | SCAC4 |
| 54 | GIES | GIESELMAN INC | | | SCAC4 |
| 55 | GIET | GIESBRECHT, A P TRUCKING INC | | | SCAC4 |
| 56 | GIEV | GLOBAL INDUSTRIAL EQUIPMENT SERVICE | | | SCAC4 |
| 57 | GIEW | GIESBRECHT, LAWRENCE TRANSPORT INC | | | SCAC4 |
| 58 | GIEX | General American Marks Co. | added 1/2003 | | NAKINA |
| 59 | GIEX | GATX Financial Corp. | added 1/2002; eliminated 1/2003 | | NAKINA |
| 60 | GIEX | GATX Capital Corp. | added 1/1998; 7/2000; eliminated 1/2002; 7/2005 | | NAKINA |
| 61 | GIEX | GATX Capital Corp. | added 1/98; 7/2000 | | NRHS |
| 62 | GIEX | GENERAL AMERICAN MARKS COMPANY [GATX CAPITAL CORPORATION] | | | PWRC |
| 63 | GIEX | General American Marks (GATX Corporation) | | | RSRV |
| 64 | GIEX | GENERAL AMERICAN MARKS COMPANY | | | SCAC4 |
| 65 | GIF | Guinee Airlines, S.A. | IATA: J9, Callsign: Guinee Airlines, | GUI | AVCODES |
| 66 | GIF | Eagle Air Guinee, S.A. | Callsign: Eagleair Guinee, | GUI | AVCODES |
| 67 | GIF | Guinee Airlines | IATA: J9 | | ICAO1 |
| 68 | GIF | Gestor de Infraestructuras Ferroviarias | | E | TRAFFIC |
| 69 | GIF | Gestor de Infraestructuras Ferroviarias | | ES | VKM |
| 70 | GIFD | GEOPOLITIC INT FORWARDERS | | | SCAC4 |
| 71 | GIFO | GIBCO FUEL LLC | | | SCAC4 |
| 72 | GIFU | Gifu Bus Co | It is a subsidiary of Nagoya Railroad and primarily operates within Gifu Prefecture. | J | TRAFFIC |
| 73 | GIG | Gacela Air Cargo, S.A. de C.V. | Callsign: Gacela Air, | MEX | AVCODES |
| 74 | GIG | Sky Guinee Airlines | | GUI | AVCODES |
| 75 | GIG | Gacela Air Cargo | | | ICAO1 |
| 76 | GIGD | GREEN IS GOOD LLC | | | SCAC4 |
| 77 | GIGG | GRIGGS OIL COMPANY INC | | | SCAC4 |
| 78 | GIGM | GIGUERE & MARCHAND OIL SERVICE INC | | | SCAC4 |
| 79 | GIGR | GIGUERE, SIMON INC | | | SCAC4 |
| 80 | GIGU | GERMAN INDUSTRIAL GASES | | | SCAC4 |
| 81 | GIH | Union Des Transports Africains de Guinee | Callsign: Transport African, | GUI | AVCODES |
| 82 | GIH | Union des Transports Africains de Guinee | | | ICAO1 |
| 83 | GIHX | Cornerstone C&M Inc. d/b/a Gifford-Hill & Co. | added 10/1997; 7/2000-7/2005 | | NAKINA |
| 84 | GIHX | Beazer West, Inc. | 1/1994; eliminated 10/1997 | | NAKINA |
| 85 | GIHX | Gifford-Hill & Co., Inc. | added 7/1978; 1/1980 | | NAKINA |
| 86 | GIHX | GFH Financial Services Corp. | added 1/1974; 1/1975 | | NAKINA |
| 87 | GIHX | GFH Financial Services Corp. | added 1/74; 1/75 | | NRHS |
| 88 | GIHX | Gifford-Hill & Co., Inc. | added 7/78; 1/80 | | NRHS |
| 89 | GIHX | Beazer West, Inc. | 1/94; eliminated 10/97 | | NRHS |
| 90 | GIHX | Cornerstone C&M Inc. d/b/a Gifford-Hill & Co. | added 10/97; 7/2000 | | NRHS |
| 91 | GIHX | CORNERSTONE C&DM INC d/b/a GIFFORD-HILL & CO. (BEAZER WEST, INC.) | | | PWRC |
| 92 | GIHX | Gifford-Hill (Hanson) | | | RSRV |
| 93 | GIHX | GIFFORD HILL & COMPANY | | | SCAC4 |
| 94 | GIIL | GILL CARRIER LLC | | | SCAC4 |
| 95 | GIJ | Guinee Airways | Callsign: Guinee Airways, | GUI | AVCODES |
| 96 | GIJ | Guinea Airways | | | ICAO1 |
| 97 | GIK | Guinea Air Transport | Callsign: Guinea Airtreansport, | GUI | AVCODES |
| 98 | GIK | Konair S.A. | | GUI | AVCODES |
| 99 | GIK | Seba Airlines | | | ICAO1 |
| 100 | GIL | Gill Air | IATA: GX, Callsign: Gillair, IATA designator changed to 9S | GB | AVCODES |
