Which organization deals with international civil aviation?

The International Civil Aviation Organization (ICAO) is the correct answer because it is the specialized agency of the United Nations responsible for promoting the safe and orderly development of international civil aviation. Established in 1944, ICAO develops and oversees international standards and regulations for civil aviation, ensuring safe and efficient air travel across countries. Its objectives include enhancing aviation safety, security, and environmental protection while also fostering cooperation among its member states.

The other organizations mentioned, while related to aviation, do not hold the same recognized status or scope of responsibility as ICAO. The International Civil Aeronautics Authority is a less commonly recognized title and does not accurately reflect the currently established organization. The Global Air Traffic Control Organization and the International Aviation Standards Board also do not exist as formal entities tasked with the overarching responsibilities governed by ICAO. They may represent aspects of aviation management but lack the international mandate and recognition that ICAO possesses in the realm of international civil aviation.