At any one time, there are a million people airborne somewhere in the world. That equates to an entire airborne city - a city in the sky. So what does it take to run a city at 30,000 feet? In this series, we set off around the world to uncover the invisible global networks and complex logistics that make it all possible.
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Getting on the ground safely takes an army of hidden experts and incredible technology.
53:01
We take it for granted, but on any journey a hidden army of people keep your plane safe.
52:59
What does it take to get 100,000 flights a day ready for take-off and up into the sky?
52:59
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