The correct answer to this is:
“Air traffic controllers”
These people are the personnel who is responsible
for the safety, orderly, and swift flow of planes flying in and out of
airports using the global air traffic control system. They are generally
stationed in air traffic control centers and control towers on the airport
ground. They monitor the position, speed, and elevation of aircraft in their designated airspace visually
and by radar,
and give directions to the pilots by
radio.
