Arrival

Inspectors get 45 seconds to ID and pick up fallen debris, across a whole runway. The smallest stray nut or chunk of rubber could be sucked into an engine and cause serious damage – potentially putting lives at risk. So it is imperative these eagle-eyed operatives don’t miss a thing.

World’s most dangerous landing in the Himalayas – this is the final approach to Paro. Paro is the capital of Bhutan, a magical Himalayan lost kingdom. Landing here is far from easy: it lacks the modern radar equipment that helps guide planes in, so pilots land manually using visual landmarks. They fly through a narrow valley with a tight turn –the runway only becomes visible at the last moment.

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.