SEAT DIMENSIONS.

SEC. 519. SEAT DIMENSIONS. Not later than 60 days after the date of enactment of this Act, the Administrator shall—(1) initiate a rulemaking activity based on the regulation described in section 577 of the FAA Reauthorization Act of 2018 (49 U.S.C. 42301 note); or (2) if the Administrator decides not to pursue the rulemaking described in paragraph (1), the Administrator shall brief appropriate committees of Congress on the justification of such decision.