The document discusses the Department of Civil Aviation (DCA) in Thailand and its role in regulating civil aviation activities according to international standards. It notes that the DCA is a government agency under the Transport Minister that aims to promote, develop and regulate civil aviation in Thailand. Key responsibilities of the DCA include implementing the Air Navigation Act, promoting national civil aviation, ensuring orderly civil aviation, making airports available to the public, and coordinating with domestic and international organizations. The document also provides examples of aviation-related international organizations like ICAO and lists some of ICAO's annexes regarding international civil aviation standards.