The CAA - the UK\'s specialist aviation regulator.

CASA\'s primary function is to conduct the safety regulation of civil air operations in Australia and the operation of Australian aircraft overseas.

One of ICAO\'s chief activities is standardization, the establishment of International Standards, Recommended Practices and Procedures covering the technical fields of aviation: licensing of personnel, rules of the air, aeronautical meteorology, aeronautical charts, units of measurement, operation of aircraft, nationality and registration marks, airworthiness, aeronautical telecommunications, air traffic services, search and rescue, aircraft accident investigation, aerodromes, aeronautical information services, aircraft noise and engine missions, security and the safe transport of dangerous goods.