| 1 | GUA | Aerotaxis de Aguascalientes, S.A. de C.V. | Callsign: Aguascalientes, | MEX | AVCODES |
| 2 | GUA | Aerotaxis de Aguascalientes | | | ICAO1 |
| 3 | GUA | | City: Guadalajara | MEX | TRAFFIC |
| 4 | GUAAF | Guangxi Air Force | Guangxi Air Force was a regional air force established around 1932 by the New Guangxi Clique under leaders Li Zongren and Bai Chongxi, operating independently until integrating with the Chinese Nationalist air force in November 1937. | ROC | TRAFFIC |
| 5 | GUAD | GUARDIAN MOVING AND STORAGE | | | SCAC4 |
| 6 | GUAF | GUARANTEED AIR FREIGHT FORWARDING, INC | | | SCAC1 |
| 7 | GUAN | GUANGDONG ETERNAL WAY INTL FREIGHT | | | SCAC4 |
| 8 | GUANG | Guangzhou Metro | | PRC | TRAFFIC |
| 9 | GUAQ | GUARRIELLO TRUCKING LLC | | | SCAC4 |
| 10 | GUAV | GUAVA EXPRESS INC | | | SCAC4 |
| 11 | GUAX | Georgia Power Co. | added 10/1982; 1/1994; eliminated 10/1999; 7/2000 (not listed); added 10/2000; 7/2005 | | NAKINA |
| 12 | GUAX | Georgia Power Co. | added 10/82; 1/94; eliminated 10/99; 7/2000; added 10/2000 | | NRHS |
| 13 | GUAX | GEORGIA POWER COMPANY | | | PWRC |
| 14 | GUAX | Georgia Power | | | RSRV |
| 15 | GUAX | GEORGIA POWER COMPANY | | | SCAC4 |
| 16 | GUAY | GUAY, L P (1987) INC | | | SCAC4 |
