The FAA is primarily responsible for the advancement, safety and regulation of civil aviation, as well as overseeing the development of the air traffic control system and commercial space travel. http://www.faa.gov
An associated body of the European Civil Aviation Conference representing the civil aviation regulatory authorities of a number of European states. http://www.jaa.nl/
CASA has the primary responsibility for the maintenance, enhancement and promotion of the safety of civil aviation in Australia. http://www.casa.gov.au/
Regulates the safety standards of Irish civil aviation and provides air traffic management and aeronautical communications services in Irish controlled airspace. http://www.iaa.ie/