This episode explores just what it takes to keep this city in the sky safe between take-off and landing. Discover how pilots find their way across thousands of miles of the sky in the dead of night. Meet the air traffic controllers who are responsible for the busiest airspace in the world - over Atlanta in south east America - and find out just what is involved in co-ordinating the 100,000 flights that cross the globe every day, while avoiding collisions.
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