Airspace Classification
Definition
The categorization of airspace into classes (A through G) based on the level of air traffic control service provided and the flight rules that apply. Class A is the most restrictive.
Related Terms
ATC Clearance
Authorization from air traffic control for an aircraft to proceed under specified conditions, including route, altitude, and speed. Pilots must receive clearance before taxiing, taking off, or landing.
Flight Level
A standard nominal altitude of an aircraft based on a standard altimeter setting (29.92 inHg / 1013.25 hPa). Flight Level 350 means 35,000 feet. Used above the transition altitude.
Separation Standards
Minimum distances or time intervals required between aircraft to ensure safety. Vertical separation is typically 1,000 feet; horizontal separation varies by radar coverage and airspace type.