each segment of air traffic services users: (i) The total costs allocable to the use of air traffic services for that segment during such fiscal year. (ii) The total revenues received from that segment during such fiscal year. (B) Validation of model (i) Review and determination Not later than 3 months after completion of the initial report required under subparagraph (A), the inspector general of the Department of Transportation shall review and determine the validity of the model used by the Administrator and the Chief Operating Officer to complete the calculations required under subparagraph (A). (ii) Validation process In the event that the inspector general determines that the model used by the Administrator and the Chief Operating Officer to complete the calculations required by subparagraph (A) is not valid— (I) the inspector general shall provide the Administrator and Chief Operating Officer recommendations on how to revise the model