Development Program: Provided further , That in addition to airports eligible under section 41743 of title 49, United States Code, such program may include the participation of an airport that serves a community or consortium that is not larger than a small hub airport, according to FAA hub classifications effective at the time the Office of the Secretary issues a request for proposals. Grants-in-aid for airports For an additional amount for Grants-In-Aid for Airports , to enable the Secretary of Transportation to make grants for projects as authorized by subchapter 1 of chapter 471 and subchapter 1 of chapter 475 of title 49, United States Code, $750,000,000, to remain available through September 30, 2021: Provided , That amounts made available under this heading shall be derived from the general fund, and such funds shall not be subject to apportionment formulas, special apportionment categories, or minimum percentages under chapter 471: Provided further , That the Secretary shall distribute funds provided under this heading as discretionary grants to airports: Provided further , That the amount made available under this heading shall not be subject to any limitation on obligations for the Grants-in-Aid for Airports program set forth in any Act: Provided further , That the Administrator of the Federal Aviation Administration may retain up to 0.5 percent of the funds provided under this heading to fund the award and oversight by the Administrator of grants made under this heading. Administrative provisions—federal aviation administration 110. None of the funds in this Act may be used to compensate in excess of 600 technical staff-years under the federally funded research and development center contract between the Federal Aviation Administration and the Center for Advanced Aviation Systems Development during fiscal year 2019. 111. None of the funds in this Act shall be used to pursue or adopt guidelines or regulations requiring airport sponsors to provide to the Federal Aviation Administration without cost