; or (ii) acquiring, by purchase or lease, eligible zero-emission vehicles and equipment (as defined in section 47102). . (b) Airport improvement program eligibility (1) Airport development defined Section 47102(3) of title 49, United States Code, as amended by this Act, is further amended by adding at the end the following: (P) converting or retrofitting vehicles and ground support equipment into eligible zero-emission vehicles and equipment or acquiring, by purchase or lease, eligible zero-emission vehicles and equipment. (Q) constructing or modifying airport facilities to install a microgrid in order to provide increased resilience to severe weather, terrorism, and other causes of grid failures. . (2) Additional definitions Section 47102 of title 49, United States Code, as amended by this Act, is further amended by adding at the end the following: (30) eligible zero-emission vehicle and equipment means a zero-emission vehicle, equipment related to such a vehicle, and ground support equipment that includes zero-emission technology that is— (A) used exclusively at a commercial service airport