A civil aviation authority (CAA) is a national or supranational statutory authority that oversees the regulation of civil aviation, including the maintenance of an aircraft register.
Due to the inherent dangers in the use of flight vehicles, national aviation authorities typically regulate the following critical aspects of aircraft airworthiness and their operation:
Depending on the legal system of the jurisdiction, a CAA will derive its powers from an act of parliament (such as the Civil or Federal Aviation Act), and is then empowered to make regulations within the bounds of the act. This allows technical aspects of airworthiness to be dealt with by subject matter experts and not politicians.
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.
A CAA will regulate the control of air traffic but a separate agency will generally carry out air traffic control functions.
In some countries a CAA may build and operate airports, including non-airside operations such as passenger terminals; the Civil Aviation Authority of Nepal and the Civil Aviation Authority of the Philippines being among such authorities. In other countries, private companies or local government authorities may own and operate individual airports.
The independent development of CAAs resulted in differing regulations from country to country. This required aircraft manufacturers in the past to develop different models for specific national requirements (such as the BAe Jetstream 31), and impeded airline travel into foreign jurisdictions. The Convention on International Civil Aviation (Chicago Convention) was signed in 1944 and addressed these issues. 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.
The Joint Aviation Authorities (JAA) was founded in 1970, for cooperation between European CAAs. It published the Joint Aviation Authorities, to create minimum standards across agencies. It was disbanded in 2009.
The European Aviation Safety Agency (EASA) was created in 2003, replacing the Joint Aviation Authorities. It standardises aviation regulations across the European Union and the European Free Trade Association. Member states continue to have their own agencies, which implement EASA rules. EASA has working relationships with non-member states including Armenia, Georgia, Moldova and Ukraine.