In this Oct. 15, 2020, file photo, United Airlines passengers wait in line to register at the SFO COVID-19 rapid testing site at San Francisco International Airport in San Francisco. San Francisco is requiring all workers at San Francisco International Airport to get vaccinated against COVID-19. Employees who are exempt must undergo weekly testing. The mandate announced Tuesday, Sept. 21, 2021, applies to roughly 46,000 on-site personnel, including employees of contractors and retail tenants. (AP Photo/Jeff Chiu, File)
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