; and (2) by adding at the end the following: (b) Failure To wear masks during public health emergency For purposes of subsection (a), an individual interferes with the performance of the duties of a flight crew member or flight attendant if such individual, without justification, disobeys a flight crew member’s or flight attendant’s instruction to wear a mask or protective face covering during the period of any national emergency declared by the President under the National Emergencies Act ( 50 U.S.C. 1601 et seq.) with respect to an infectious disease that is, or is reasonably believed to be, caused by a pathogen transmissible by respiratory droplets expelled from the nose or mouth. . (d) Conforming amendment Section 46301 of title 49, United States Code, is amended— (1) in subsection (a)(5) by inserting section 50202, section 50203, after chapter 451, ; and (2) in subsection (d)(2) by inserting , section 50202, section 50203, after of this title . 3. Regulations for air carriers to reduce spread of infectious diseases (a) In general In coordination with the Director of the Centers for Disease Control and Prevention, the Secretary shall promulgate regulations requiring each air carrier operating under part 121 of title 14, Code of Federal Regulations, and operating aircraft with a seating capacity of 20 or more to implement appropriate measures on a flight in air transportation for the purpose of reducing the likelihood of any passenger or crewmember contracting an infectious disease. Such regulations shall be effective only during the period of a national emergency declared by the President under the National Emergencies Act ( 50 U.S.C. 1601 et seq.) relating to a public health emergency. (b) Deadlines In conducting the rulemaking required under subsection (a), the Secretary shall issue— (1) a notice of proposed rulemaking not later than 180 days after the date of enactment of this Act