[1][2] A CAA may also be involved in the investigation of aircraft accidents, although in many cases this is left to a separate body (such as the Australian Transport Safety Bureau (ATSB) in Australia or the National Transportation Safety Board (NTSB) in the United States), to allow independent review of regulatory oversight.
In other countries, private companies or local government authorities may own and operate individual airports.
This then led to the establishment by the United Nations of the International Civil Aviation Organization (ICAO) in 1947 which now oversees member states, and works to implement regulatory changes to ensure that best practice regulations are adopted.
It published the Joint Aviation Requirements (JAR), to create minimum standards across agencies.
EASA has working relationships with non-member states including Armenia, Georgia, Moldova and Ukraine.