; (2) flight schools certificated under part 141 of title 14, Code of Federal Regulations; (3) training centers certificated under part 142 of title 14, Code of Federal Regulations; and (4) manufacturers and suppliers of flight simulation training devices (as defined in part 1 of title 14, Code of Federal Regulations, and Appendix F to part 60 of such title). (d) GAO study on FAA National Simulator Program (1) In general Not later than 18 months after the date of enactment of this Act, the Comptroller General shall conduct a study on the National Simulator Program of the FAA that is part of the Training and Simulation Group of the Air Transportation Division. (2) Considerations In conducting the study required under paragraph (1), the Comptroller General shall, at a minimum, assess— (A) how the program described in paragraph (1) is maintained to reflect and account for advancement in technologies pertaining to flight simulation training devices (as defined in part 1 of title 14, Code of Federal Regulations, and appendix F to part 60 of such title); (B) the staffing levels, critical competencies, and skills gaps of FAA personnel responsible for carrying out and supporting the program described in paragraph (1)