Air Traffic Control Airspace Classes Ceiling 
Pilot Institute
FEBRUARY 12, 2025
In busy airspace (Class B, C, D, and E surface areas), airport beacons are often turned on during the day when ground visibility is less than 3 miles or the ceiling is less than 1,000 feet. This isnt a strict rule, but its especially common at airports where Air Traffic Control (ATC) staff can control the beacons.
Pilot Institute
JUNE 27, 2025
The FAA defines controlled airspace as “a generic term that covers the different classifications of airspace (Class A, Class B, Class C, Class D, and Class E airspace) and defined dimensions within which air traffic control service is provided to IFR and VFR flights.”
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