AIR TRAFFIC CONTROLLER

Somewhere in the world an aircraft takes off every four seconds, navigating this dense global Air traffic is only possible because of the voice the pilots hear in the head, the belong to Air traffic controller. the voice of air traffic controller is a matter of life an dead. Most controllers are qualified to work in the system, Being the frontline controller is one of the most stimulating job in the world and one of the most stressful, where one mistake, one moment of forgetfulness, one slip of tongue can mean disaster. 
Controllers love their job and some can't do without their job, guiding the aircraft through the vast highway in the sky. All airspace is divided into three dimensional sector, each of the sector monitored by air traffic controller. From the time it takes off until the time it lands, the aircraft is guided along it's route by number of different controller. 
 
Once off the runway a flight is handed from controller to controller, from the tower to terminal radar control or Tracon then to En routes center then back to Tracon at the destination airport and finally to the tower for landing. 
There are over 200,000 private an commercial aircraft that operate around the globe, everyday the carry over four million people from one airport to another, landing an taking off on a finite of runway and flying through an increasingly congested sky. To cope with the rush, new technology are set to revolutionize the guidance of aircraft through the sky. So let's get down on some basic of air traffic controller, Heathrow for instant, the Heathrow control tower is 87m tall, higher enough to see the ends of both runways and at it's top it's the visual control center, the Nerve center of air traffic control.  
 Running an airport at 98 capacity requires skills an focus, the demand is such the controller by law are not allowed to work more than 90 minutes at a time. The are widely considered the best in the world. Air traffic control is splatted into key sectors handling  each stage of airplane journey through the airport. 
 
Ground controller gives pilot permission to push back and starts their engines, the then direct them safely to the runway, and with planes not design to reverse, the grown controller can't afford to make any mistake. Departure isn't about first come first serve, gaps have to be left between take off to allow air turbulence to clear the behind departing plane, smaller aircraft must leave a big gap behind bigger aircrafts, so the controller organizes planes by sizes, weight and departure route to allow them to take off much closer together. As passenger it might feels like other plane are cue-jumping but in fact the controller is trying to minimize delays.  
By the end of the day Heathrow air traffic control will have safely handle nearly fourteen hundred take off and landing, no one else in the world squeezes as many aircraft through two stripe of tarmac. Airport is like city that never sleeps for Air traffic controllers so we can put our life in their hands.