City in the Sky
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.
Arrival
There are around a million people airborne at any one time. But what goes up must come down - and getting passengers safely back to earth depends on complex global networks and some astonishing technology.
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