Convention on International Civil Aviation

The Convention on International Civil Aviation, also known as the Chicago Convention, established the International Civil Aviation Organization (ICAO), a specialized agency of the United Nations (UN) charged with coordinating international air travel. The convention establishes rules of airspace, aircraft registration and safety, security, and sustainability, and details the rights of the signatories in relation to air travel.

Source: Wikipedia — Convention on International Civil Aviation (CC BY-SA 4.0)