; and (B) displacing an individual with an assigned seat. (4) Class of service The term class of service means first class, business class, general economy (including basic economy), or premium economy. (5) No additional cost The term no additional cost means no added charge for the seat beyond the fare. (6) Secretary The term Secretary means the Secretary of Transportation. (7) Young child The term young child means an individual who is 13 years of age or younger on the date of the scheduled departure of the flight. (h) Regulations The Secretary may issue regulations to implement this section, including regulations that amend the definitions in subsection (g). (i) Effective date This section shall take effect on the date that is 180 days after the date of the enactment of the this section. . (b) Clerical amendment The analysis of chapter 417 of title 49, United States Code, is amended by inserting after the item relating to section 41726 the following: 41727. Seating young children adjacent to an accompanying adult on aircraft. . (c) Repeal of FAA Extension, Safety, and Security Act of 2016 family seating provision Section 2309 of the FAA Extension, Safety, and Security Act of 2016 ( 49 U.S.C. 42301 note prec.) is repealed.