- GA
Go-Around
- GASAG
Global Aviation Security Action Group
- GATS
General Agreement on Trade in Services (under WTO)
- GCA
Ground-controlled approach
- GCAS
Ground Collision Avoidance System
- GCU
Generator Control Unit
- GDOP
Geometric Dilution Of Precision
- GDS
Global Distribution System
- GGS
Global positioning system Ground Station
- GHz
Gigahertz
- GLNS
GPS Landing and Navigation System
- GLNU
GPS Landing and Navigation Unit
- GLOC
g-Induced Loss of Consciousness, where g is acceleration relevant to the acceleration caused by gravity
- GLONASS
Global Navigation Satellite System
- GLS
GPS Landing System
- GLU
GPS Landing Unit
- GMT
Greenwich Mean Time
- GND
Ground
- GND
Ground
- GNSS
Global Navigation Satellite Systems
- GNSS
Global Navigation Satellite System
- GP
Glide Path
- GPS
Global Positioning System (US)
- GPS
Global Positioning Satellite or Global Positioning System
- GPS
Global Positioning System
- GPWC
Ground Proximity Warning Computer
- GPWS
Ground Proximity Warning System
- GPWS
Ground Proximity Warning System
- GPWS
Ground Proximity Warning System
- GS
Glideslope
- GSA
General Sales Agent
- GSE
Ground Support Equipment
- GSP
Ground Service Provider
- GTAA
Greater Toronto Airport Authority
