ICAOICAO Annex 11
ICAO Annex 11 — Air Traffic Services
Read the official ruleAnnex 11 defines air traffic services — the establishment of airspace and ATS units, the provision of area, approach and aerodrome control, flight information and alerting services, and separation standards. It underpins how controlled airspace is organised worldwide. *Summary only — consult ICAO and your ANSP.*
This is an original plain-English explanation for training and reference, not legal advice and not for navigation. Always rely on the current official rule linked above. Last reviewed June 2, 2026.