; (2) any obstacles to enforcement; and (3) trends in Department of Transportation enforcement actions. (c) Report Not later than 1 year after the date of enactment of this Act, the Comptroller General shall submit to the appropriate committees of Congress a report on the study, including the Comptroller General’s findings, conclusions, and recommendations. 3116. Dimensions for passenger seats (a) In general Not later than 18 months after the date of enactment of this Act, the Administrator of the Federal Aviation Administration shall initiate a proceeding to study the minimum seat pitch for passenger seats on aircraft operated by air carriers (as defined in section 40102 of title 49, United States Code). (b) Considerations In reviewing any minimum seat pitch under subsection (a), the Administrator shall consider the safety of passengers, including passengers with disabilities. 3117. Cell phone voice communications (a) In general Subchapter I of chapter 417 is amended by adding at the end the following: 41725. Cell phone voice communications (a) Prohibition authority The Secretary of Transportation may issue regulations— (1) to prohibit an individual on an aircraft from engaging in voice communications using a mobile communications device during a flight of that aircraft in scheduled passenger interstate or intrastate air transportation; and (2) that exempt from the prohibition described in paragraph (1)— (A) any member of the flight crew on duty on an aircraft; (B) any flight attendant on duty on an aircraft