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Watch City in the Sky online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Dallas Campbell and Dr Hannah Fry investigate what it takes to get a million people and their luggage off the ground and up in the air. From building the world's biggest passenger plane to navigating through the busiest airport on the planet, to the perils of getting airborne in the coldest city on earth - Dallas and Hannah go to extremes to get under the skin of the remarkable story of departure. You will never look at flying in the same way again.