By David Shepardson WASHINGTON (Reuters) -President Joe Biden’s administration will extend requirements for travelers to wear masks on airplanes, trains and buses and at airports and train stations through mid-March, sources briefed on the matter told Reuters, amid concerns about a new COVID-19 variant. A formal announcement extending the requirements through March 18 is expected on Thursday, the sources said. The White House and the Transportation Security Administration (TSA) declined to comment. The TSA in August extended the transportation mask order through Jan. 18. Biden plans to discuss…

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