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Monthly Passengers on U.S. Scheduled Airlines (Domestic + International), Seasonally Adjusted January 2018 - March 2021 | Bureau of Transportation Statistics
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2021 global air passenger totals show improvement from 2020, but still only half pre-pandemic levels
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July Air Passenger Traffic Decreased 73% from a Year Ago, But Rose 30% from June | WVIK, Quad Cities NPR
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Estimating and projecting air passenger traffic during the COVID-19 coronavirus outbreak and its socio-economic impact - ScienceDirect
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