Definition
A suite of air traffic control decision-support tools developed by NASA and the FAA that helps controllers manage arrival, departure, and en route traffic flows between an Air Route Traffic Control Center (ARTCC) and a Terminal Radar Approach Control (TRACON) facility. CTAS uses computer-generated trajectory predictions to advise controllers on efficient sequencing, spacing, and runway assignments for arriving aircraft.
Plain English
A computer system that helps air traffic controllers smoothly hand off and sequence aircraft as they move from high-altitude en route airspace into the busy airspace around a major airport.
Context Anchor
Pilots may see CTAS in FAA acronym lists, traffic flow discussions, or material about how controllers manage arrivals into busy airports.
Derivation
The name reflects what it does: it automates coordination between the Center (ARTCC, which handles en route traffic) and the TRACON (which handles arrivals and departures near a busy airport). Knowing those two facilities makes the acronym easy to remember.
Why Pilots Care
It reduces delays and improves safety by helping controllers manage high volumes of traffic more efficiently.
Intuition Check
Do not read “center” here as the middle of something. In this term, “center” means an air traffic control facility that handles aircraft over a large region.
Example Sentence 1
CTAS helps controllers sequence dozens of arrivals per hour into a busy hub airport without losing safe spacing.
Example Sentence 2
During peak hours, CTAS helps the tower manage the flow of departures and arrivals without excessive holding.