<![CDATA[This study examines the effectiveness of airspace sector division within the Area Control Centre (ACC) Sector East, Jakarta Flight Information Region (FIR), in facilitating efficient air traffic flow by Air Traffic Control (ATC) personnel. The continuous annual growth of air traffic necessitates a responsive and efficient sectorization system. The research aims to evaluate the current airspace sector structure from operational, technical, and human resource perspectives. Employing a quantitative descriptive method with an evaluative design, the study focuses on two key variables: ATC workload and inter-sector coordination. Data were collected from 58 ATC personnel at AirNav Indonesia’s Jakarta Air Traffic Service Centre (JATSC) through a Likert scale (1–5) questionnaire to measure workload distribution, coordination, and their relationship with sectorization effectiveness. The findings reveal that effective sector division significantly enhances ATC performance, communication efficiency, and coordination, while workload imbalance and route complexity negatively impact operational flow. It is concluded that optimizing sector design and coordination mechanisms can improve work efficiency and overall safety within Jakarta FIR. The study provides valuable insights for AirNav Indonesia in refining airspace management policies and designing future sector divisions based on empirical evaluation]]>
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