UNITED STATES SHARE OF PROJECT COSTS.

SEC. 17. UNITED STATES SHARE OF PROJECT COSTS. (a) General Provision.—Except as provided in subsections (b), (c), and (d) of this section, the United States share payable on account of any approved airport development project submitted under section 16 of this part may not exceed 50 per centum of the allowable project costs. (b) Projects in Public Land States.—In the case of any State containing unappropriated and unreserved public lands and non-taxable Indian lands (individual and tribal) exceeding 5 per centum of the total area of all lands therein, the United States Share under subsection (a) shall be increased by whichever is the smaller of the following percentages thereof: (1) 25 per centum, or (2) a percentage equal to one-half of the percentage that the area of all such lands in that State is of its total area. (c) Projects in the Virgin Islands.—-The United States share payable on account of any approved project for airport development in the Virgin Islands shall be any portion of the allowable project84 Stat. 229costs of the project, not to exceed 75 per centum, as the Secretary considers appropriate for currying out the provisions of this part. (d) Landing Aids.—To the extent that the project costs of an approved project for airport development represent the cost of (1) hind required for the installation of approach light systems, (2) touchdown zone and centerline runway lighting, or (3) high intensity runway lighting, the Ignited States share shall be not to exceed 82 per centum of the allowable costs thereof.