Section 152.107 - Project eligibility: Airport development(a) Except in the case of approved stage development, each project for airport development must provide for-(1) Development of an airport or unit of an airport that is safe, useful, and usable; or,(2) An additional facility that increases the safety, usefulness, and usability of an airport.(b) Unless otherwise authorized by the Administrator, a project for airport development must involve more than $25,000 in United States funds.(c) The development included in a project for airport development must- (1) In the opinion of the Administrator, be "airport development" as defined in § 152.3 ;(2) Be identified as airport development in the mandatory standards incorporated into this part by § 152.11 ; and(3) Be described in an approved airport layout plan.(d) The airport involved in a project for airport development must be included in the current NASP.(e) In complying with paragraph (a) of this section, the sponsor must- (1) Own, acquire, or agree to acquire control over, or a property interest in, runway clear zones that the Administrator considers adequate; and(2) Provide for approach and runway lighting systems satisfactory to the Administrator.