A-Z Airfreight Directory
Contains an index of aviation authorities worldwide.
http://www.azfreight.com/azworld/az-aptas.htm#d

A-Z World Airports Online
International index of airports and aviation authorities.
http://www.azworldairports.com/airports/

Canadian Transportation Agency
Homepage of the government body responsible for the aviation sector in Canada.
http://www.cta-otc.gc.ca/

Civil Aviation Authority
South Africa's aviation regulator.
http://www.caa.co.za/

Civil Aviation Authority
The CAA is responsible for the safety of all airline passengers in New Zealand.
http://www.caa.govt.nz/

Civil Aviation Authority
The UK's specialist aviation regulator.
http://www.caa.co.uk/

Civil Aviation Safety Authority
The site tells you all you need to know about current aviation safety rules and regulations in Australia.
http://www.casa.gov.au/

Federal Aviation Authority
The FAA is responsible for the safety of civil aviation in the United States.
http://www.faa.gov/

Irish Aviation Authority
Irish aviation regulator.
http://www.iaa.ie/