| 3001 | GLBF | Globalfer S.p.A. | | I | TRAFFIC |
| 3002 | GLBF | GLOBALFER S.P.A. | | IT | VKM |
| 3003 | GLBH | GLEBA INCORPORATED | | | SCAC4 |
| 3004 | GLBK | GILL, B TRUCKING LTD | | | SCAC4 |
| 3005 | GLBN | GLOBAL INTERNATIONAL | | | SCAC4 |
| 3006 | GLBO | GLOBAL CARRIER INC. | | | SCAC4 |
| 3007 | GLBP | GILBERTSON TRUCKING LTD | | | SCAC4 |
| 3008 | GLBS | GILBERT & SONS TRUCKING, INC. | | | SCAC1 |
| 3009 | GLBS | GILBERT & SONS TRUCKING INC | | | SCAC4 |
| 3010 | GLBU | LANXESS CORPORATION | | USA | BIC |
| 3011 | GLBU | Chemtura Corporation | | | RSRV |
| 3012 | GLBV | GLOBAL EXPRESS SERVICES CORP | | | SCAC4 |
| 3013 | GLBZ | TRAC LEASE INC. | | | PWRC |
| 3014 | GLBZ | Trac Lease | | | RSRV |
| 3015 | GLC | Global Aircargo Co. | | BRN | AVCODES |
| 3016 | GLC | Galecor, Inc. | | USA | AVCODES |
| 3017 | GLC | Global Aircargo | | | ICAO1 |
| 3018 | GLC | GREAT LAKES CENTRAL RAILROAD | | | PWRC |
| 3019 | GLC | Great Lakes Central Railroad | | | RSRV |
| 3020 | GLC | GREAT LAKES CENTRAL RAILROAD | | | SCAC4 |
| 3021 | GLC | Great Lakes Central Railroad | | USA | TRAFFIC |
| 3022 | GLCA | GLC OCEAN LINES LIMITED | | | SCAC4 |
| 3023 | GLCG | GILCO TRUCKING | | | SCAC4 |
| 3024 | GLCJ | GLC TRANSPORTATION INC | | | SCAC4 |
| 3025 | GLCK | GALLATIN TRANSPORTATION INC | | | SCAC4 |
| 3026 | GLCM | GENESIS ATTACHMENTS LLC | | | SCAC4 |
| 3027 | GLCO | GUILLORY OIL CO INC | | | SCAC4 |
| 3028 | GLCQ | GULFSTREAM FUELING INC | | | SCAC4 |
| 3029 | GLCS | GIL CASTRO, LAURA LUZ ELENA | | | SCAC4 |
| 3030 | GLCU | FLEXI-VAN LEASING, INC. | | | PWRC |
| 3031 | GLCU | Flex-Van Leasing (Goldline Container) | | | RSRV |
| 3032 | GLCX | Great Lakes Carbon LLC | added 1/2004; 7/2005 | | NAKINA |
| 3033 | GLCX | Great Lakes Carbon Corp. | added 4/1973; 1/1975-7/2000; eliminated 1/2004 | | NAKINA |
| 3034 | GLCX | Great Lakes Chemical Corp. | added 1/1961; 4/1961-7/1965; eliminated 1/1966 | | NAKINA |
| 3035 | GLCX | Great Lakes Chemical Corp., Division of Great Lakes Oil and Chemical Co. | elimiminated 1/1961 | | NAKINA |
| 3036 | GLCX | Great Lakes Chemical Corp. | added 10/1958 | | NAKINA |
| 3037 | GLCX | Great Lakes Car Line Corp. | 1/1943 (not listed) | | NAKINA |
| 3038 | GLCX | Great Lakes Chemical Corp. | added 10/58; 4/61-7/65; eliminated 1/66 | | NRHS |
| 3039 | GLCX | Great Lakes Carbon Corp. | added 4/73; 1/75-7/2000 | | NRHS |
| 3040 | GLCX | *GREAT LAKES CAR LINE CORP. | | | PWRC |
| 3041 | GLCX | *GREAT LAKES CHEMICAL CORP. | | | PWRC |
| 3042 | GLCX | +GREAT LAKES CARBON LLC | | | PWRC |
| 3043 | GLCX | Great Lakes Carbon | | | RSRV |
| 3044 | GLCX | GREAT LAKES CARBON LLC | | | SCAC4 |
| 3045 | GLCY | GLANCY TRUCKING | | | SCAC4 |
| 3046 | GLCZ | GREAT LAKES COTTON CORPORATION | | | PWRC |
| 3047 | GLD | Golden Star Air Cargo Co. Ltd. | Callsign: Golden Star, | SUD | AVCODES |
| 3048 | GLD | Golden Star Air Cargo | | | ICAO1 |
| 3049 | GLD | GRAY LINE OF DENVER | | | SCAC4 |
| 3050 | GLDF | GOLD COAST FREIGHTWAYS, INC | | | SCAC1 |
| 3051 | GLDF | GOLD COAST FREIGHTWAYS INC | | | SCAC4 |
| 3052 | GLDG | GOLDEN GATE PETROLEUM | | | SCAC4 |
| 3053 | GLDI | GLOVA-LINK DISTRIBUTION INC | | | SCAC4 |
| 3054 | GLDL | GOLD LINE TRANSPORT INC | | | SCAC4 |
| 3055 | GLDM | GOLDSTAR LOGISTICS LLC | | | SCAC4 |
| 3056 | GLDN | GOLDEN STRIP TRANSFER, INC | | | SCAC1 |
| 3057 | GLDN | GOLDEN STRIP TRANSFER INC | | | SCAC4 |
| 3058 | GLDQ | G & L DISTRIBUTION | | | SCAC4 |
| 3059 | GLDT | GOLDEN CHARIOT TRUCK LINE, INC | | | SCAC1 |
| 3060 | GLDU | TOUAX GROUP | | F | BIC |
| 3061 | GLDU | GOLD CONTAINER CORP | | | SCAC4 |
| 3062 | GLDV | GOLD TRANSPORTATION SERVICES | | | SCAC4 |
| 3063 | GLDW | GOLDEN WEST TRANSPORTATION | | | SCAC4 |
| 3064 | GLDX | Glades Gas Co. | added 7/1961; 7/1965; eliminated 4/1966 | | NAKINA |
| 3065 | GLDX | Glades Gas Co. | 7/65; eliminated 4/66 | | NRHS |
| 3066 | GLDX | GLADES GAS CO. | | | PWRC |
| 3067 | GLDY | GOLD COUNTRY TRUCKING | | | SCAC4 |
| 3068 | GLE | Goliaf Air | Callsign: Goliaf Air, | STP | AVCODES |
| 3069 | GLE | Goliaf Air | | | ICAO1 |
| 3070 | GLEA | GARELAN TRANSPORT LTD | | | SCAC4 |
| 3071 | GLED | GLEN-DI INC | | | SCAC4 |
| 3072 | GLEE | GLOSSON ENTERPRISES INC | | | SCAC4 |
| 3073 | GLEF | GROUPE LEFEBURE MRP INC | | | SCAC4 |
| 3074 | GLEH | GOTHAM LOGISTICS INC | | | SCAC4 |
| 3075 | GLEI | GRACE LIGHTNING EXPRESS INC | | | SCAC4 |
| 3076 | GLEIS | G&L Bau R. Brachendorf GmbH | | DE | VKM |
| 3077 | GLEK | GREAT LAKES ELECTRONICS CORPORATION | | | SCAC4 |
| 3078 | GLEM | GRITTS TRANSPORT LIMITED LIABILITY | | | SCAC4 |
| 3079 | GLEN | GLENDENNING MTRWYS INC | | | PWRC |
| 3080 | GLEN | GLENS TRUCK & EQUIPMENT GLEN LORSHB | | | SCAC4 |
| 3081 | GLES | GREUEY, LESTER A | | | SCAC4 |
| 3082 | GLET | GLENN, DAN TRUCKING | | | SCAC4 |
| 3083 | GLEU | GREAT LAKES & EUROPEAN LINE INC | | | SCAC4 |
| 3084 | GLEY | GALENA LOGISTICS LLC | | | SCAC4 |
| 3085 | GLF | Gulfstream Aerospace | Callsign: Gulfstream Test, | USA | AVCODES |
| 3086 | GLF | Gulfstream Aerospace | | | ICAO1 |
| 3087 | GLFA | GOOD LUCK FARM & FREIGHT | | | SCAC4 |
| 3088 | GLFB | GULF & CARIBBEAN CARGO INC | | | SCAC4 |
| 3089 | GLFC | GULF COAST TRANSPORTATION | | | SCAC4 |
| 3090 | GLFF | GREAT LAKES CUSTOMS BROKERAGE INC | | | SCAC4 |
| 3091 | GLFI | GULF LINE TRANSPORT INC | | | SCAC4 |
| 3092 | GLFK | GULF PACKAGING INC | | | SCAC4 |
| 3093 | GLFM | GOLFMOBILES | | | SCAC4 |
| 3094 | GLFN | GREAT LAKES FRAME COMPANY INC, THE | | | SCAC4 |
| 3095 | GLFO | GULF OFFSHORE TRANSPORTATION SERVIC | | | SCAC4 |
| 3096 | GLFP | GLF TRANSPORTATION LTD | | | SCAC4 |
| 3097 | GLFS | GULFSTREAM LINE INC | | | SCAC4 |
| 3098 | GLFT | GLEFI SHIPPING XXXII CO LTD MONROVI | | | SCAC4 |
| 3099 | GLFX | GULF POWER COMPANY | | | SCAC4 |
| 3100 | GLG | Aerolineas Galapagos S.A. AeroGal | IATA: 2K, Callsign: Aerogal, Name changed to Avianca Ecuador w.e.f. 18 June 2014. IATA Designator changed from 2K* | EC | AVCODES |
