; and (B) issue a notice pursuant to subsection (c) that an air carrier may apply to provide basic essential air service to such place for compensation under this section and select an applicant pursuant to such subsection. (4) Continuation of service If the Secretary makes a determination under paragraph (3) to terminate an order issued to an air carrier under this section, the Secretary shall ensure continuity in air service to the affected place. . 566. Essential air service authorization Section 41742(a)(2) of title 49, United States Code, is amended by striking $155,000,000 for fiscal year 2018 and all that follows through May 10, 2024, and inserting $348,544,000 for fiscal year 2024, $340,000,000 for fiscal year 2025, $342,000,000 for fiscal year 2026, $342,000,000 for fiscal year 2027, and $350,000,000 for fiscal year 2028 . 567. GAO study on costs of essential air service (a) Study The Comptroller General shall conduct a study of the change in costs of the essential air service program under sections 41731 through 41742 of title 49, United States Code. (b) Contents In conducting the study required under subsection (a), the Comptroller General shall— (1) assess trends in costs of the essential air service program under sections 41731 through 41742 of title 49, United States Code, over the 10-year period ending on the date of enactment of this Act; and (2) review potential causes for the increased cost of the essential air service program, including— (A) labor costs; (B) fuel costs; (C) aging aircraft costs; (D) air carrier opportunity costs; (E) airport costs