; and (2) by adding at the end the following: (2) On and after date of transfer On and after the date of transfer (as defined in section 90101(a)), oversight of air traffic control towers that receive funding under this section shall be carried out in accordance with performance-based regulations and minimum safety standards prescribed under section 90501. . (c) Criteria To evaluate participants Section 47124 of title 49, United States Code, is amended by adding at the end the following: (d) Criteria To evaluate participants (1) Timing of evaluations (A) Towers participating in cost-share program In the case of an air traffic control tower that is operated under the program established under subsection (b)(3), the Secretary shall annually calculate a benefit-to-cost ratio with respect to the tower. (B) Towers participating in contract tower program In the case of an air traffic control tower that is operated under the program established under subsection (a) and continued under subsection (b)(1), the Secretary shall not calculate a benefit-to-cost ratio after the date of enactment of this subsection with respect to the tower unless the Secretary determines that the annual aircraft traffic at the airport where the tower is located has decreased— (i) by more than 25 percent from the previous year