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In this July 2, 2021 photo, a traveler walks in Terminal 3 as a sign stating face coverings are required is displayed at O'Hare International Airport in Chicago.  The leading U.S. airlines say that the rise in COVID-19 cases is hurting ticket sales and pushing back the recovery of the travel industry. American, United, Delta, Southwest and others reported setbacks in regulatory filings Thursday, Sept. 9. (AP Photo/Nam Y. Huh) **FILE**

In this July 2, 2021 photo, a traveler walks in Terminal 3 as a sign stating face coverings are required is displayed at O'Hare International Airport in Chicago. The leading U.S. airlines say that the rise in COVID-19 cases is hurting ticket sales and pushing back the recovery of the travel industry. American, United, Delta, Southwest and others reported setbacks in regulatory filings Thursday, Sept. 9. (AP Photo/Nam Y. Huh) **FILE**

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