; and (2) privately owned airports used or intended to be used for public purposes that do not have scheduled air service. (b) Application required The operator or sponsor of an airport, or the community in which an airport is located, seeking, on behalf of the airport, to participate in the program established under subsection (a) shall submit an application to the Secretary in such form, at such time, and containing such information as the Secretary may require, including— (1) an assessment of the needs of the airport for additional or improved hangars, airport businesses, or other facilities; (2) the ability of the airport to leverage private sector investments on the airport or develop public-private partnerships to build or improve facilities at the airport; and (3) if the application is submitted by a community, evidence that the airport supports the application. (c) Limitation (1) State limit Not more than 4 airports in the same State may be selected to participate in the program established under subsection (a) in any fiscal year. (2) Dollar amount limit Not more than $500,000 shall be made available for any one-time grant to an airport in any fiscal year under the program established under subsection (a). (d) Priorities In selecting airports for participation in the program established under subsection (a), the Secretary shall give priority to airports at which— (1) the operator or sponsor of the airport, or the community in which the airport is located— (A) will provide a portion of the cost of the project for which assistance is sought under the program from local sources; (B) will employ best business practices in developing or implementing a public-private partnership; or (C) has established, or will establish, a public-private partnership to build or improve facilities at the airport