| Abbreviation | Definition |
|---|---|
| GCC | Gillette-Campbell County Airport, Gillette, Wyoming USA |
| GCFV | Fuerteventura/Puerto del Rosar, S-Spain |
| GCHI | Hierro, S-Spain |
| GCI | Guernsey, UK |
| GCK | Garden City Regional Airport, Garden City, Kansas USA |
| GCLA | La Palma, S-Spain |
| GCLB | Gran Canaria El Berriel Airport |
| GCLP | Las Palmas/Gran Canaria, S-Spain |
| GCM | Grand Cayman Island, West Indies |
| GCN | Grand Canyon National Park Airport, Grand Canyon, Arizona USA |
| GCRR | Arrecife/Lanzarote, S-Spain |
| GCTS | Santa Cruz de Tenerife-Sur, S-Spain |
| GCXO | Tenerife Norte-Los Rodeos, S-Spain |
| GCY | Greenville, Tennessee USA |
| GDA | Gounda, Central African Republic |
| GDB | Granite Falls Municipal Airport / Lenzen Roe Memorial Field, Granite Falls, Minnesota (formerly 1G2) |
| GDD | Gordon Downs, Western Australia, Australia |
| GDE | Gode, Ethiopia |
| GDG | Magdagachi, Russia |
| GDH | Golden Horn, Alaska USA |