| Term | Definition / Meaning / Stand for |
| GEO |
Cheddi Jagan International Airport (Guyana) |
| GUP |
Gallup Municipal Airport (USA) |
| GZT |
Gaziantep Oğuzeli International Airport (Turkey) |
| GDN |
Gdańsk Lech Wałęsa Airport (Poland) |
| GTE |
General Travel Expenses |
| GVA |
Geneva International Airport (Switzerland) |
| GRJ |
George Airport (South Africa) |
| GCM |
George Town Airport (Cayman Islands) |
| GRR |
Gerald R. Ford International Airport (Michigan, USA) |
| GMP |
Gimpo International Airport (Seoul, South Korea) |
| GRO |
Girona-Costa Brava Airport (Spain) |
| GLA |
Glasgow Airport (UK) |
| GLC |
Global Leisure Corporation |
| GOI |
Goa International Airport (India) |
| GOL |
Gol Linhas Aéreas (Brazilian airline) |
| GLD |
Good Luggage Discount |
| GTO |
Gorontalo Airport (Indonesia) |
| GOT |
Gothenburg Landvetter Airport (Sweden) |
| GUL |
Goulburn Airport (Australia) |
| GHB |
Governor's Harbour Airport (Bahamas) |
| GFK |
Grand Forks International Airport (North Dakota, USA) |
| GJT |
Grand Junction Regional Airport (Colorado, USA) |
| GRR |
Grand Rapids Airport (Michigan, USA) |
| GRB |
Green Bay Austin Straubel International Airport |
| GWO |
Greenwood-Leflore Airport (Mississippi, USA) |
| GNB |
Grenoble Alpes-Isère Airport (France) |
| GRS |
Grosseto Airport (Italy) |
| GDL |
Guadalajara International Airport (Mexico) |
| GUM |
Guam International Airport (USA) |
| GUM |
Guam International Airport |
| GUA |
Guatemala City International Airport |
| GUA |
Guatemala La Aurora International Airport |
| GCI |
Guernsey Airport (UK) |
| GEO |
Guyana's International Airport |
| GYD |
Heydar Aliyev International Airport (Azerbaijan) |
| GYE |
José Joaquín de Olmedo International Airport (Ecuador) |
| GUA |
La Aurora International Airport (Guatemala) |
| GND |
Maurice Bishop International Airport (Grenada) |
| GOH |
Nuuk Airport (Greenland) |
| GCM |
Owen Roberts International Airport (Cayman Islands) |
| GIG |
Rio de Janeiro Galeão International Airport (Brazil) |
| GNY |
Sanliurfa GAP Airport (Turkey) |
| GBE |
Sir Seretse Khama International Airport (Botswana) |
| GVN |
Sovetskaya Gavan Maygatka Airport (Russia) |
| GRU |
São Paulo-Guarulhos International Airport (Brazil) |
| GRU |
São Paulo-Guarulhos International Airport |
| GETA |
Gay European Tourism Association |
| GTAT |
General Tourism Aptitude Test |
| GOA |
Genoa Cristoforo Colombo Airport (Italy) |
| GNTA |
Georgian National Tourism Administration |
| GSTA |
German Speaking Travel Alliance |
| GCET |
Global Code of Ethics for Tourism |
| GDS |
Global Distribution System |
| GDS |
Global Distribution System |
| GITH |
Global Institute Of Tourism And Hospitality |
| GLONO |
Global Nomad |
| GPS |
Global Positioning System |
| GSTC |
Global Sustainable Tourism Council |
| GSTC |
Global Sustainable Tourism Criteria |
| GGDT |
Godwin Glacier Dogsled Tours |
| GGTT |
Golden Gate Tours Travel |
| GST |
Goods and Services Tax (in travel pricing) |
| GST |
Goods and Services Tax |
| GBAO |
Gorno-Badakhshan Autonomous Oblast |
| GCBC |
Grand Case Beach Club |
| GMDP |
Grands Moulins De Paris |
| GHETTO |
Greater Houston Educational Travel and Tourism Organization |
| GMTT |
Green Meadows Travel and Tourism |
| GIT |
Group Inclusive Tour |
| GIT |
Group Inclusive Tour |