Air Traffic Control Aviation FAQ

Air traffic controllers must be fluent in English, as it is the international language of aviation. Fluency is required to ensure clear, unambiguous communication with pilots, especially on international flights or in mixed-language airspace.

Most countries require controllers to meet at least ICAO Level 4 English proficiency, which includes speaking, listening, and understanding aviation phraseology and plain language. This level is tested as part of the selection or licensing process and must be maintained throughout the career. Fluency in the local language may also be required for domestic operations.