A look at the unseen side of aviation. With unprecedented access to the world of air traffic control, the series puts the spotlight on the hidden army of controllers whose job it is to keep our skies safe.

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Why does fog cause delays? And how does the NATS team respond to such severe weather disruption?
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At NATS, air traffic controllers guide a passenger jet with a major technical fault safely back to the ground and respond to an unidentified flying object detected on the radar screens.