Caa

CAA is an acronym that can refer to several organizations and technical concepts across different fields. The most common uses are the Civil Aviation Authority, the Canadian Automobile Association, and Certification Authority Authorization in the Domain Name System. The exact meaning depends on context, and the term is often written as CAA.

Civil Aviation Authority refers to national bodies responsible for regulating civil aviation safety, licensing, and compliance within their jurisdictions. These authorities oversee airworthiness certification of aircraft, pilot and air traffic controller licensing, airline safety, and passenger protections. Examples include the United Kingdom Civil Aviation Authority, with similar agencies in other countries. The specific powers and organizational structures vary by country.

The Canadian Automobile Association is a federation of affiliated automobile clubs in Canada that provides member services such as roadside assistance, travel planning, insurance, and discounts. It originated to support motorists and today operates as a nonprofit organization with regional clubs, travel guides, and partnerships. Services typically include emergency highway assistance, trip planning resources, and member discounts.

In DNS, Certification Authority Authorization (CAA) is a resource record type that allows domain owners to specify which certificate authorities are permitted to issue certificates for their domain. Defined in RFC 8659, a CAA record includes fields such as flags, a tag, and a value. The common tags are "issue" and "issuewild" (for ordinary and wildcard certificates), and "iodef" to indicate a contact for policy violations. Publishing CAA records helps prevent unauthorized certificate issuance; in the absence of CAA records, some certificate authorities may still issue certificates depending on policy.