; and (III) not later than 3 months after completion of the revised initial report required under subparagraph (A), the Inspector General shall review and determine the validity of the revised model used by the Administrator and the Chief Operating Officer to complete the calculations required by subparagraph (A). (iii) Access to data The Administrator and the Chief Operating Officer shall provide the Inspector General of the Department of Transportation with unfettered access to all data produced by the cost accounting system operated and maintained pursuant to subsection (e). (C) Report to Congress Not later than 60 days after completion of the review and receiving a determination that the model used is valid under subparagraph (B), the Administrator and the Chief Operating Officer shall submit to the Committee on Transportation and Infrastructure, the Committee on Appropriations, and the Committee on Ways and Means of the House of Representatives, and the Committee on Commerce, Science, and Transportation, the Committee on Appropriations, and the Committee on Finance of the Senate a report describing the results of the calculations completed under subparagraph (A). (D) Publication Not later than 60 days after submission of the report required under subparagraph (C), the Administrator and Chief Operating Officer shall publish the initial report, including any revision thereto if required as a result of the validation process for the model. (2) Air traffic services biennial data reporting (A) Biennial data reporting Not later than March 31, 2019, and biennially thereafter for 8 years, the Administrator and the Chief Operating Officer shall, using the validated model, complete the following calculations for each segment of air traffic services users for the most recent full fiscal year: (i) The total costs allocable to the use of the air traffic services for that segment. (ii) The total revenues received from that segment. (B) Report to Congress Not later than 15 days after completing the calculations under