Glossary

Control Area Extensions
Portions of controlled airspace extending from a control zone or terminal area to protect arriving and departing IFR aircraft.

Cloud and Visibility OK
Meteorological term meaning no significant weather; visibility 6+ statute miles, no cloud below 5000 feet AGL, no cumulonimbus, no significant weather phenomena.

Computer Based Training
Training delivered electronically, allowing students to progress through material independently.

Common Traffic Advisory Frequency
A frequency used by pilots to self-announce positions and intentions at uncontrolled aerodromes.

Class F Advisory Area 
Special use airspace where activities may take place that require extra vigilance by pilots (e.g., training areas).

Class F Danger Area 
Airspace where activities dangerous to flight may occur (e.g., gunnery, aerial testing).

Class F Restricted Area 
Airspace where flight is restricted due to safety, security, or environmental concerns.

Control Zone
Controlled airspace established around an aerodrome, usually from the surface to 3000 feet AGL, to protect arriving and departing aircraft.