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From statista
"It is expected that 2020 will set a new record in terms of the number of scheduled passengers with over 4.72 billion, around 137 percent higher than in 2004."
Wanna bet?
I can't find how many different passengers fly each year.
In other words, how many repeats are there.
I'm guessing that way fewer than 1 billion, maybe even only 100 million make up all the individuals.
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