Definition
Airports without an operating air traffic control tower. Pilots are responsible for sequencing themselves into the traffic pattern, separating from other aircraft, and coordinating their movements by self-announcing position and intentions on a Common Traffic Advisory Frequency (CTAF). The airport may have no tower at all, or it may have a tower that is closed during certain hours -- when the tower is closed, the airport operates as non-towered.
Plain English
An airport where there is no controller telling pilots what to do. Pilots watch out for each other, talk to each other on a shared radio frequency, and decide for themselves when it is safe to take off, land, or move on the ground.
Context Anchor
You encounter this term when learning how to arrive, depart, taxi, and communicate at airports without an operating control tower.
Derivation
Non- means 'not.' A 'tower' at an airport is the elevated cab where air traffic controllers work. So 'non-towered' literally means 'without a working control tower.' The term replaced the older phrase 'uncontrolled airport,' which was misleading -- these airports are not uncontrolled, they are pilot-controlled by shared procedure and radio communication.
Why Pilots Care
Pilots must actively listen, communicate, and yield to maintain separation since no controller is directing traffic.
Intuition Check
Non-towered does not mean there are no rules or that the airport is unsafe. It means there is no operating tower controller managing the traffic, so pilots must coordinate and use the established procedures themselves.
Example Sentence 1
Before departing the non-towered airport, she announced her intentions on the CTAF and listened for any inbound traffic.
Example Sentence 2
Many training flights take place at non-towered airports where pilots practice self-separation on every takeoff and landing.