; and (2) by inserting after subsection (c), the following: (d) Maintenance improvements (1) In general Not later than 18 months after the date of enactment of this subsection, the Administrator shall identify and implement reasonable alternative mitigations to improve maintenance of FAA-owned weather observing systems that experience frequent service outages, including associated surface communication outages. (2) Spare parts availability The mitigations identified by the Administrator shall improve spare parts availability, including consideration of storage of more spare parts in the region of the equipment. (3) Application This subsection shall apply only to airports located in non-contiguous States. (e) Notice of outages (1) In general Not later than 18 months after the date of enactment of this subsection, the Administrator shall update FAA Order 7930.2 Notices to Air Missions, or any successive order, to incorporate weather system outages for Automated Weather Observing Systems and Automated Surface Observing Systems associated with Service A Outages. (2) Application This subsection shall apply only to airports located in non-contiguous States. . 618. Contract Tower Program Section 47124 of title 49, United States Code, as amended by section 527, is amended— (1) in subsection (b)(3), by adding at the end the following: (H) Period for completion of an Operational Readiness Inspection The Federal Aviation Administration shall provide airport sponsors that show good faith efforts to join the Contract Tower Program 7 years to complete an Operational Readiness Inspection after receiving a benefit-to-cost ratio. ; (2) by redesignating subsection (f) as subsection (h)