How is Class G airspace different from other airspaces?

Class G airspace is different from other class of airspace because it is the only class of airspace that is uncontrolled. It is not charted; it can exist even where class A, B, C, D, E or F doesn’t exist.

Neither VFR (Visual Flight Rules) nor IFR (Instrument Flight Rules) aircrafts need an ATC clearance to fly in class G airspace. In fact, radio communication is not required in class G airspace even for IFR operations.

Class G includes airspace below 14,500 feet. It is the airspace closest to the ground. Class G airspace only exceed 1,200 feet AGL when approaching a mountainous terrain or when approaching over sparsely populated areas.