A Certificate of Airworthiness (CofA), or an airworthiness certificate, is issued for an aircraft by the national aviation authority in the state in which the aircraft is registered. The airworthiness certificate attests that the aircraft is airworthy insofar as the aircraft conforms to its type design. Each airworthiness certificate is issued in one of a number of different categories. In the USA, Australia and some other countries, each airworthiness certificate is classified as either a standard airworthiness certificate or a special airworthiness certificate.