By David Shepardson WASHINGTON (Reuters) – President Joe Biden’s administration will extend requirements for travelers to wear masks on airplanes, trains and in transit hubs through April 18 as public health authorities review when mask requirements should be dropped, the White House confirmed. The move extends the current requirements that were set to expire March 18 by a month. The Transportation Security Administration (TSA) and Centers for Disease Control and Prevention (CDC) said in statements Thursday that CDC will work with other government agencies “to help inform a revised policy fram…