The Air Traffic Control is an important aspect of what makes airplanes and airports so easy to navigate. Air traffic control (ATC) began in the 1930's with a system that used teletype machines, wall sized blackboards, large table maps and markers representing airplanes. Controllers used the markers across the map to estimate the position of the aircraft. Although a radar system was developed during WWII, the procedures of the ATC were yet manual. Uncover more about Radio Communication here.