Definition
Within an Air Route Traffic Control Center (ARTCC), a high sector is a controller's assigned block of airspace that covers the upper altitudes — typically at and above FL240 — where high-altitude en route traffic, mostly turbojet aircraft, is worked.
Plain English
It's the slice of airspace one ARTCC controller is responsible for at high altitudes. Center airspace is split into pieces by both location and height, and the 'high' pieces handle the airliners and jets cruising up high.
Context Anchor
You may hear or read this term when learning how ARTCCs divide en route traffic among controllers, especially during cruise or climb into higher altitudes.
Derivation
Sector comes from a Latin word meaning “to cut.” In ATC, a sector is a piece cut out of a larger area of airspace. High tells you this piece is for higher-altitude traffic.
Why Pilots Care
Ensures proper separation and efficient routing for high-flying aircraft by dedicated controllers familiar with high-altitude operations.
Intuition Check
Do not read high sector as meaning “the highest place aircraft can fly.” Here, high means one assigned controller area for higher-altitude en route traffic, with limits set locally.
Example Sentence 1
Climbing through 24,000 feet, the controller handed us off to the high sector for the rest of the climb to FL370.
Example Sentence 2
Controllers in high sectors often manage multiple jets transitioning between centers.