| 3101 | GLG | Aerolineas Galapagos S.A. AeroGal | IATA: 2K, Callsign: Aerogal, IATA Designator changed to 2K | EC | AVCODES |
| 3102 | GLG | Avianca Ecuador d/b/a Avianca | IATA: 2K, Callsign: Galapagos, Name changed from Aerolineas Galapagos S.A. AeroGal w.e.f. 18 June 2014. IATA Designator changed from 2K* | EC | AVCODES |
| 3103 | GLG | Aerogal | IATA: 2K | | ICAO1 |
| 3104 | GLG | Aerolineas Galapagos S.A. AeroGal | now Avianca Ecuador S.A. | EC | TRAFFIC |
| 3105 | GLG | Gmeinder Lokomotivenfabrik GmbH | | DE | VKM |
| 3106 | GLGC | GREEN LOGISTICS CANADA INC | | | SCAC4 |
| 3107 | GLGD | GREENTREE LOGISTICS INC | | | SCAC4 |
| 3108 | GLGE | G L G EXPRESS INC | | | SCAC4 |
| 3109 | GLGF | GC LOGISTICS | | | SCAC4 |
| 3110 | GLGI | GREEN LINE GLOBAL INTERNATIONAL COR | | | SCAC4 |
| 3111 | GLGJ | GOLDING TRANSPORT INC | | | SCAC4 |
| 3112 | GLGM | G T LOGISTICS INC | | | SCAC4 |
| 3113 | GLGN | GLOBAL LOGISTICS SOLUTIONS INC | | | SCAC4 |
| 3114 | GLGR | GLG TRUCKING CO INC | | | SCAC4 |
| 3115 | GLGS | GOLDSTAR LOGISTICS CORPORATION | | | SCAC4 |
| 3116 | GLGU | GLOBAL GAS SERVICES LLC | | | SCAC4 |
| 3117 | GLGY | GEOLOGICAL SURVEY OF CANADA | | | SCAC4 |
| 3118 | GLH | Gleneagle Helicopters Services (Scotland) Ltd. | Callsign: Glen, | GB | AVCODES |
| 3119 | GLH | Chervon Corporation | Callsign: Gulfhawk, | USA | AVCODES |
| 3120 | GLHA | GILCHRIST, AUGUSTUS | | | SCAC4 |
| 3121 | GLHB | GB LOGISTICS LLC | | | SCAC4 |
| 3122 | GLHF | GENERAL LOGISTICS SOLUTIONS CORP | | | SCAC4 |
| 3123 | GLHG | GARNETT, L H & GIRLS | | | SCAC4 |
| 3124 | GLHH | GREAT LAKES HEAVY HAUL INC | | | SCAC4 |
| 3125 | GLHV | GLOBE SERVICES INC | | | SCAC4 |
| 3126 | GLHW | GARGOYLE LOGISTICS INC | | | SCAC4 |
| 3127 | GLHY | GALLEGOS AYON TRUCKING | | | SCAC4 |
| 3128 | GLI | Gallic Aviation | Callsign: Gallic, | F | AVCODES |
| 3129 | GLIC | GIST LOGISTICS INC | | | SCAC4 |
| 3130 | GLIE | G-LINE TRUCKING INC | | | SCAC4 |
| 3131 | GLIK | GRACE LINE | | | SCAC4 |
| 3132 | GLIL | GLOBETROTTER LOGISTICS INC | | | SCAC4 |
| 3133 | GLIM | GLEAMRAY MARITIME INC | | | SCAC4 |
| 3134 | GLINE | Gray Line | | USA | TRAFFIC |
| 3135 | GLIP | GEL LOGISTICS INCORPORATED | | | SCAC4 |
| 3136 | GLIR | GREAT | | | SCAC4 |
| 3137 | GLIS | GALLANT TRANSPORT INC | | | SCAC4 |
| 3138 | GLIU | MACCAUGHRIN MARITIME MARINE SYSTEMS | | | SCAC4 |
| 3139 | GLIV | GT LOGISTICS INC | | | SCAC4 |
| 3140 | GLIW | G-LINE | | | SCAC4 |
| 3141 | GLIW | PKM Gliwice | | PL | TRAFFIC |
| 3142 | GLIX | Georgia Power Co. | added 10/2007 | | NAKINA |
| 3143 | GLIX | GEORGIA POWER CO. | | | PWRC |
| 3144 | GLIX | GEORGIA POWER COMPANY | | | SCAC4 |
| 3145 | GLJ | Global Jet Austria GmbH | Callsign: Global Austria, | A | AVCODES |
| 3146 | GLJ | Global Jet Austria | | | ICAO1 |
| 3147 | GLJE | GOLDEN LOGISTICS LLC | | | SCAC4 |
| 3148 | GLJG | GAMERO LOGISTICS LLC | | | SCAC4 |
| 3149 | GLJH | GREAT LAKE BOAT HAULERS | | | SCAC4 |
| 3150 | GLJI | GRASMICK, LOUIS J LUMBER CO INC | | | SCAC4 |
| 3151 | GLJL | GLJ FISHING CO LTD | | | SCAC4 |
| 3152 | GLJM | GONZALEZ LEIJA, EDUARDO MARTIN | | | SCAC4 |
| 3153 | GLK | Aspan Airlines JSC | Callsign: Kazak, | KZ | AVCODES |
| 3154 | GLKB | GARELICK FARMS LLC | | | SCAC4 |
| 3155 | GLKE | GREAT LAKES AREA EXPRESS, INC | | | SCAC1 |
| 3156 | GLKE | GREAT LAKES AREA EXPRESS INC | | | SCAC4 |
| 3157 | GLKF | GREAT LAKES FLEET INC | | | SCAC4 |
| 3158 | GLKH | GRACEFUL LION TRUCKING CORPORATION, | | | SCAC4 |
| 3159 | GLKI | GREAT LAKES MODULAR CORPORATION | | | SCAC4 |
| 3160 | GLKK | GREEN PLAINS GRAIN COMPANY LLC | | | SCAC4 |
| 3161 | GLKL | GREAT LAKES TRUCK BROKEAGE LLC | | | SCAC4 |
| 3162 | GLKM | GLIK IMPORTS INC | | | SCAC4 |
| 3163 | GLKN | GLK TRANSPORT INC | | | SCAC4 |
| 3164 | GLKO | GLENKO ENTERPRISES (1994) LTD | | | SCAC4 |
| 3165 | GLKS | GREAT LAKES TRUCKING CO INC | | | SCAC4 |
| 3166 | GLKU | LANXESS CORPORATION | | USA | BIC |
| 3167 | GLKU | GREAT LAKES CHEMICAL CORP. | | | PWRC |
| 3168 | GLKU | Great Lakes Chemical Corporation | | | RSRV |
| 3169 | GLKU | GREAT LAKES CHEMICAL CORPORATION | | | SCAC4 |
| 3170 | GLKV | GREAT LAKES AVIATION LTD | | | SCAC4 |
| 3171 | GLKX | Great Lakes Chemical Corp. | added 4/1982; 1/1994-7/2005; eliminated 10/2006 | | NAKINA |
| 3172 | GLKX | Great Lakes Coal & Coke Co. | 7/1937-4/1938 (not listed) | | NAKINA |
| 3173 | GLKX | Great Lakes Chemical Corp. | added 4/82; 1/94-7/2000 | | NRHS |
| 3174 | GLKX | *GREAT LAKES COAL & COKE CO. | | | PWRC |
| 3175 | GLKX | +GREAT LAKES CHEMICAL CORP. | | | PWRC |
| 3176 | GLKX | Great Lakes Chemical Corporation | | | RSRV |
| 3177 | GLKX | GREAT LAKES CHEMICAL CORP | | | SCAC4 |
| 3178 | GLKY | GREAT LAKES BOAT TRANSPORT | | | SCAC4 |
| 3179 | GLL | Air Gemini, Lda | Callsign: Twins, | ANG | AVCODES |
| 3180 | GLL | Air Gemini | | | ICAO1 |
| 3181 | GLLA | Gray Line of Los Angeles | | US-CA | TRAFFIC |
| 3182 | GLLB | GILLES BOSSE & FILS INC | | | SCAC4 |
| 3183 | GLLC | GULLICKSON, TOM INC | | | SCAC4 |
| 3184 | GLLE | GLOBAL LINES (BRAZIL) | | | SCAC1 |
| 3185 | GLLE | GRANDVIEW LOGISTICS LLC | | | SCAC4 |
| 3186 | GLLF | GLOBAL ALLIANCE LINE | | | SCAC4 |
| 3187 | GLLG | GLOBAL LINK LOGISTICS | | | SCAC4 |
| 3188 | GLLI | GREENLINE LOGISTICS INC | | | SCAC4 |
| 3189 | GLLO | GLOBAL TRUCKING LLC | | | SCAC4 |
| 3190 | GLLT | GALLANT TRANSPORT LTD | | | SCAC4 |
| 3191 | GLLU | GLOBAL CONTAINER LOGISTICS,LLC | | RUS | BIC |
| 3192 | GLLX | Great Lakes Locomotive L.L.C. | 7/2005 (not listed) | | NAKINA |
| 3193 | GLLX | GREAT LAKES LOCOMOTIVE LLC | | | PWRC |
| 3194 | GLLX | GREAT LAKES LOCOMOTIVE LLC | | | SCAC4 |
| 3195 | GLLX | Great Lakes Locomotive L.L.C. | | USA | TRAFFIC |
| 3196 | GLM | Aero Services Mali | Callsign: Global Mali, | RMM | AVCODES |
| 3197 | GLMC | GREAT LAKES MOTORCOACH | | | SCAC4 |
| 3198 | GLMD | GLOBAL MANUFACTURING CANADA | | | SCAC4 |
| 3199 | GLME | GILMORE MOVING & STORAGE | | | SCAC4 |
| 3200 | GLMG | GLACIER STATE MOVING & STORAGE INC | | | SCAC4 |
