The Biden administration announced Wednesday that it is extending the nationwide mask requirement for airplanes and public transit for 15 days as it monitors an uptick in COVID-19 cases. The Centers for Disease Control and Prevention said it was extending the order, which was set to expire on April 18, until May 3 to allow more time to study the BA.2 omicron subvariant that is now responsible for the vast majority of cases in the U.S.