In this April 24, 2020, file photo, empty United Airlines ticket machines are shown at the Tampa International Airport in Tampa, Fla. United Airlines will send layoff warnings to 36,000 employees - nearly half its U.S. staff - in the clearest signal yet of how deeply the virus outbreak is hurting the airline industry. United officials said Wednesday, July 8, that they still hope to limit the number of layoffs by offering early retirement, but they have to send notices this month to comply with a law requiring that workers get 60 days' notice ahead of mass job cuts. (AP Photo/Chris O'Meara, File)
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