The Chicago Convention at the international meeting in Chicago in 1944. All the countries active in international air transport participated in.
This convention founded an international authority, ICAO (International Civil Aviation Organisation), with headquarters in Montreal (Canada).
It draws a distinction between scheduled and non-scheduled air transport.
It defines the relation between the states on technical and commercial subjects concerning international air transport.
Scheduled services can be operated as per the agreement between the two countries concerned.
Non-scheduled services can be operated as per the rules framed by the individual government.