Premiered February 2017

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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Video from the Series

Test what you know about the City in the Sky

Do you know what it takes to keep the City in the Sky running? Test your knowledge with our interactive quiz.

Check out these flight explainers

How Pilots Find Their Way in the Sky

The ‘Jet Men’ and the Principles of Flight Explained

Explore Each Episode

Episode 1: Departure

Episode 1: Departure

Explore a midair metropolis of a million people on flights that crisscross the world.

Episode 2: Airborne

Episode 2: Airborne

We take it for granted, but on any journey a hidden army of people keep your plane safe.

Episode 3: Arrival

Episode 3: Arrival

Getting on the ground safely takes an army of hidden experts and incredible technology.

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