Masks aren’t required on U.S. flights for now after a federal judge lifted a nationwide mask mandate covering planes and other forms of public transportation, though the Department of Justice is filing an appeal to overturn the decision after a request from the Centers for Disease Control and Prevention (CDC). The lifting of the mask mandate has led some people on social media to express their concerns for immunocompromised passengers. Some medical experts, including Leana Wen, M.D., a public health professor at George Washington University and CNN medical analyst, have previously said that “one-way masking,” where someone is wearing a...