City in the Sky - Season 1 Episode 3 -

Dallas Campbell and Dr Hannah Fry conclude the series by examining the process of bringing a plane safely to the ground. Hannah meets air traffic controllers at the world's busiest airport and visits a site that has seen over 2000 unscheduled landings in the last decade. Dallas sits in the cockpit of a plane heading for Paro, Bhutan, a place where only 26 pilots in the world are qualified to land.