Flight Netair001 Departure to Arrival
By the end of the first decade of powered flight, people began to realize that aircraft, like automobiles, would crash into each other unless some means was developed to control and direct them.
At first, because aircraft could not fly very high, such control was accomplished using simple hand signals. Later, control was exercised through radio communication.
By the end of World War II,An ATCO at work the invention of radar permitted visually displayed tracking of several aircraft at once. When coupled with radio communication, radar made it possible for the pilot to be warned when he was in danger of colliding with another aircraft or when he was off course. Today, aircraft are continually tracked from take-off to landing