Special Report

50 Ways Air Travel Has Changed Over the Last 100 Years

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2008: Global Entry begins at some airports

Source: Win McNamee / Getty Images News via Getty Images

2011: TSA PreCheck introduced

Source: Chip Somodevilla / Getty Images News via Getty Images

2018: Airlines begin charging for seat assignments

Source: Jeff J Mitchell / Getty Images News via Getty Images

2021: U.S. requires passengers and crews to wear masks

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