eligible airport-related project
(3) Eligible airport-related project .— The term “eligible airport-related project” means any of the following projects: (A) A project for airport development or airport planning under subchapter I of chapter 471. (B) A project for terminal development described in section 47119(a). (C) A project for costs of terminal development referred to in subparagraph (B) incurred after August 1, 1986 , at an airport that did not have more than .25 percent of the total annual passenger boardings in the United States in the most recent calendar year for which data is available and at which total passenger boardings declined by at least 16 percent between calendar year 1989 and calendar year 1997. (D) A project for airport noise capability planning under section 47505. (E) A project to carry out noise compatibility measures eligible for assistance under section 47504, whether or not a program for those measures has been approved under section 47504. (F) A project for constructing gates and related areas at which passengers board or exit aircraft. In the case of a project required to enable additional air service by an air carrier with less than 50 percent of the annual passenger boardings at an airport, the project for constructing gates and related areas may include structural foundations and floor systems, exterior building walls and load-bearing interior columns or walls, windows, door and roof systems, building utilities (including heating, air conditioning, ventilation, plumbing, and electrical service), and aircraft fueling facilities adjacent to the gate. (G) A project for converting vehicles and ground support equipment used at a commercial service airport to low-emission technology (as defined in section 47102) or to use cleaner burning conventional fuels, retrofitting of any such vehicles or equipment that are powered by a diesel or gasoline engine with emission control technologies certified or verified by the Environmental Protection Agency to reduce emissions, or acquiring for use at a commercial service airport vehicles and ground support equipment that include low-emission technology or use cleaner burning fuels if the airport is located in an air quality nonattainment area (as defined in section 171(2) of the Clean Air Act ( 42 U.S.C. 7501(2) )) or a maintenance area referred to in section 175A of such Act ( 42 U.S.C. 7505a ) and if such project will result in an airport receiving appropriate emission credits as described in section 47139.