This work explains how air traffic control is regulated internationally and includes brief details of each countries system. The many related subjects include navigational aids, radio phraseology, flight plans, interception and emergency procedures, as well as weather reporting and an International Civil Aviation Organisation airport code letter listing. The use of air band radios by aviation enthusiasts is an increasingly popular hobby. It not only assists the identification of aircraft flying overhead, but also provides an insight into the complex world of air traffic control.