AS9100 is a quality management system standard for the aerospace industry. It is based on ISO 9001, and provides additional requirements specific to the aerospace industry. Initially released the Society of Automotive Engineers, SAE International in 1999, it has been revised since then from AS9000 to AS 9100. AS9100c is the latest release.
AS9100 is the result of the combined effort a various aerospace organizations that had each their own quality management standards or specifications. The harmonization of their requirements while using as a base ISO 9001:2000, with its process approach orientation, drove the release of AS9000 and ended a period where it was extremely difficult to comply with the various requirements of these organizations.
ISO 9001 compliant or certified companies can achieve AS9100 compliance by implementing the additional requirements, which go above and beyond the quality requirements of ISO 9001 in order to ensure product safety.
Just like other standards such as ISO 9001 and ISO 14001, certification assessments are done by registrars worldwide.