There is no U.S. federal mandate on masks in airports or on airplanes, leaving U.S. airlines to enforce their own rules that passengers must wear face coverings while traveling.
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“Although rare, we continue to put passengers who refuse to follow the required face-covering rules on our no-fly list,” Bastian said in the memo, which was reviewed by Reuters.
To obtain a boarding pass, passengers on major U.S. airlines have to check a box confirming that they will follow the mask policy.
Airline gate agents can deny boarding to anyone not wearing a mask before the flight. But on the plane, there is little flight attendants can do to ensure compliance other than threatening to put passengers on a list that would ban them from future travel on that airline.