Effective communication is crucial in aviation to ensure safe and efficient operations. To address this need, the International Civil Aviation Organization (ICAO) has established language proficiency requirements for pilots, air traffic controllers, aeronautical station operators, and other aviation professionals who communicate in English.

To improve the safety of aviation globally, the International Civil Aviation Organization (ICAO) developed an international standard for language proficiency requirements. ICAO requires that all pilots, air traffic controllers and aeronautical station operators involved in international operations must be able to speak and understand English to a level 4 proficiency of ICAO’s language proficiency rating scale.