In view of the increase in air traffic, there has been a great deal of work by the nations of the world, under the auspices of ICAO, toward developing the concept for a future air navigation infrastructure to serve worldwide civil aviation efficiency. Even though the concept is well described and implementation is beginning, only technical manuals are available to advance the systems concept. This book describes the global vision for the Future Air Navigation System (FANS) and is the first text of its kind dedicated solely to Communications Navigation, Surveillance/Air Traffic Management and the CNS/ATM systems concept. In addition to the technical issues associated with CNS/ATM, the book also examines institutional, economic, labour and Human Factors issues. It is designed as a text usable in the classroom environment in universities and aviation technical schools.