112 STAT. 2681-445 PUBLIC LAW 105-277—OCT. 21, 1998 available until September 30, 2001, and of which $248,000,000 shall remain available until September 30, 1999: Provided, That there may be credited to this appropriation funds received from States, counties, municipalities, other public authorities, and private sources, for expenses incurred in the establishment and modernization of air navigation facilities: Provided further, That none of the funds in this Act or any other Act making appropriations for fiscal year 1999 may be obligated for bulk explosive detection systems until 30 days after the FAA Administrator certifies to the House and Senate Committees on Appropriations, in writing, that the major air carriers responsible for providing aircraft security at Category X airports have agreed to: (1) begin assuming the operation and maintenance costs of such machines beginning in fiscal year 1999; and (2) substantially increase the usage of such machines above the level experienced as of April 1, 1998: Provided further. That none of the funds provided under this heading for "Next Generation Navigation Systems" may be obligated or expended for activities related to phase two or phase three of the wide area augmentation system. RESEARCH, ENGINEERING, AND DEVELOPMENT (AIRPORT AND AIRWAY TRUST FUND) Notwithstanding any other provision of law, for necessary expenses, not otherwise provided for, for research, engineering, and development, as authorized under part A of subtitle VII of title 49, United States Code, including construction of experimental facilities and acquisition of necessary sites by lease or grant, $150,000,000, to be derived from the Airport and Airway Trust Fund and to remain available until September 30, 2001: Provided, That there may be credited to this appropriation funds received from States, counties, municipalities, other public authorities, and private sources, for expenses incurred for research, engineering, and development. GRANTS-IN-AID FOR AIRPORTS (LIQUIDATION OF CONTRACT AUTHORIZATION) (AIRPORT AND AIRWAY TRUST FUND) Notwithstanding any other provision of law, for liquidation of obligations incurred for grants-in-aid for airport planning and development, and for noise compatibility planning and programs as authorized under subchapter I of chapter 471 and subchapter I of chapter 475 of title 49, United States Code, and under other law authorizing such obligations, $1,600,000,000, to be derived from the Airport and Airway Trust Fund and to remain available until expended: Provided, That none of the funds in this Act shall be available for the planning or execution of programs the obligations for which are in excess of $1,950,000,000 in fiscal year 1999 for grants-in-aid for airport planning and development, and noise compatibility planning and programs, notwithstanding section 47117(h) of title 49, United States Code: Provided further, That no more than $975,000,000 of funds limited under this heading may be obligated prior to the enactment of a bill extending contract
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