policy of an air carrier that has an open or flexible seating policy in place that generally allows adjacent family seating as described under this section. (d) Young child In this section, the term young child means an individual who has not attained 14 years of age. 517. Passenger experience advisory committee (a) In general The Secretary shall establish an advisory committee to advise the Secretary and the Administrator in carrying out activities relating to the improvement of the passenger experience in air transportation customer service. The advisory committee shall not duplicate the work of any other advisory committee. (b) Membership The Secretary shall appoint the members of the advisory committee, which shall be comprised of at least 1 representative of each of— (1) mainline air carriers