; and (2) by inserting after the item relating to section 47139 the following: 47140. Increasing the energy efficiency of airport power sources. . 153. Extension of grant authority for compatible land use planning and projects by State and local governments Section 47141(f) of title 49, United States Code, is amended by striking September 30, 2017 and inserting September 30, 2023 . 154. Updating airport noise exposure maps Section 47503(b) of title 49, United States Code, is amended to read as follows: (b) Revised maps (1) In general An airport operator that submitted a noise exposure map under subsection (a) shall submit a revised map to the Secretary if, in an area surrounding an airport, a change in the operation of the airport would establish a substantial new noncompatible use, or would significantly reduce noise over existing noncompatible uses, that is not reflected in either the existing conditions map or forecast map currently on file with the Federal Aviation Administration. (2) Timing A submission under paragraph (1) shall be required only if the relevant change in the operation of the airport occurs during— (A) the forecast period of the applicable noise exposure map submitted by an airport operator under subsection (a); or (B) the implementation period of the airport operator’s noise compatibility program. . 155. Stage 3 aircraft study (a) Study Not later than 180 days after the date of enactment of this Act, the Comptroller General of the United States shall initiate a review of the potential benefits, costs, and other impacts that would result from a phaseout of covered stage 3 aircraft. (b) Contents The review shall include— (1) a determination of the number, types, frequency of operations, and owners and operators of covered stage 3 aircraft