At any given moment, there are 8,000 to 20,000 planes in flight – which means that, at any given moment, there are hundreds of thousands of human beings sitting in the sky, far above the planet's surface. https://t.co/KRbcGKMDS2 HT @flightradar24 pic.twitter.com/xYeHJj3qYp
— Steve Stewart-Williams (@SteveStuWill) January 2, 2020
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