; (3) is directed to remove a mask or face covering by an air carrier employee, a law enforcement officer, or a person performing functions governed under chapter 449; or (4) has another reason identified by the Administrator in any regulations promulgated under this section. (b) Responsibilities to individuals with disabilities (1) Relationship to other laws Nothing in this section shall be construed to abridge any right, or excuse the performance of any duty, arising under any applicable requirements of chapter 126 of title 42 or, to the extent applicable, section 41705 of this title or regulations issued pursuant to such chapter or section. (2) Additional duties of airport operator If an employee or contractor of an airport operator is providing assistance to an air carrier passenger covered under chapter 126 of title 42 or section 41705 of this title, such employee or contractor shall assist such individual— (A) in donning or removing a mask or face covering required under subsection (a); (B) in taking any reasonable measures, consistent with any applicable guidelines of the Centers for Disease Control and Prevention, necessary for the individual to reduce the chance of infection with the disease; and (C) in complying with any legal, air carrier, or airport requirement intended to reduce the spread of the disease. 50204. Protective masks and equipment among air carrier employees during public health emergencies (a) In general 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 airborne disease, each air carrier operating under part 121 of title 14, Code of Federal Regulations, shall— (1) require each cabin crewmember to wear a mask or protective face covering and permit such crewmember to wear protective eyewear or a face shield while on board an aircraft or in a vehicle of the air carrier