Historical Development of the Air Traffic Control System

Early attempts to provide a semblance of air traffic control were based on simple "rules of the road" resulting from the European sponsored International Convention for Air Navigation (1919). The United States formulated its first regulations relating to air traffic following the passage of the Air Commerce Act of 1926. By 1930, radio equipped airport traffic control towers were being established by some local (municipal) authorities. In 1933 instrument flying commenced, and by 1935 several airlines jointly established the first Airway Traffic Control centers to safeguard their aircraft against midair collisions. In 1936 this preliminary effort was transferred to the Federal Government, and the first-generation Air Traffic Control (ATC) System was born. This generation pioneered the development of ATC procedures, rules and regulations, the establishment of a nationwide ATC system for both civil and military air traffic, and certain new equipment and facilities. The advent of radar in the early 1950\´s marked the inauguration of the second-generation system, which carried on, expanded, and improved the accomplishments of the first generation, and brought into operational use radar and direct center/pilot communication capability. In the early 1960\´s the third generation came into being with the introduction of automation. Recognizing the need to develop a more comprehensive approach to solving the requirements of ever increasing air traffic volume, an upgraded third-generation system was postulated in 1969. The third/upgraded third generations will merge during the 1970\´s. From this base, the ATC System will transition to a fourth generation, which may be expected to be defined during the first half of the 1970\´s, with initial implementation commencing perhaps in the early 1980\´s.