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Airline passengers, some not wearing face masks following the end of Covid-19 public transportation rules, wait at a Transportation Security Administration (TSA) checkpoint to clear security before boarding to flights in the airport terminal in Denver, Colorado on April 19, 2022. - Mask mandates on public transportation are no longer in effect following a ruling by federal judge on April 18, 2022. (Photo by Patrick T. FALLON / AFP) (KEYSTONE/AFP/PATRICK T. FALLON)