; and (2) a timeline for the issuance of any guidance concerning unfair and deceptive practices among air ambulance providers, including guidance for States and political subdivisions of States to refer such matters to the Secretary. 421. Refunds for other fees that are not honored by a covered air carrier Not later than 1 year after the date of enactment of this Act, the Secretary of Transportation shall promulgate regulations that require each covered air carrier to promptly provide a refund to a passenger of any ancillary fees paid for services related to air travel that the passenger does not receive, including on the passenger’s scheduled flight, on a subsequent replacement itinerary if there has been a rescheduling, or for a flight not taken by the passenger. 422. Advance boarding during pregnancy Not later than 180 days after the date of enactment of this Act, the Secretary of Transportation shall review air carrier policies regarding traveling during pregnancy and, if appropriate, may revise regulations, as the Secretary considers necessary, to require an air carrier to offer advance boarding of an aircraft to a pregnant passenger who requests such assistance. 423. Consumer complaint process improvement (a) In general Section 42302(c) of title 49, United States Code is amended— (1) in the matter preceding paragraph (1), by striking An air carrier or foreign air carrier providing scheduled air transportation using any aircraft that as originally designed has a passenger capacity of 30 or more passenger seats and inserting Each air carrier and foreign air carrier ; (2) in paragraph (1), by striking air carrier and inserting carrier