PUBLIC LAW 101-516—NOV. 5, 1990 104 STAT. 2161 tion of necessary sites by lease or grant, $205,000,000, to be derived from the Airport and Airway Trust Fund and to remain available until expended: 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) For liquidation of obligations incurred for airport planning and development under section 14 of Public Law 91-258, as amended, and under other law authorizing such obligations, and obligations for noise compatibility planning and programs, $1,400,000,000, 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 commitments for which are in excess of $1,800,000,000 in fiscal year 1991 for grants-in-aid for airport planning and development, and noise compatibility planning and programs, notwithstanding section 506(e)(4) of the Airport and Airway Improvement Act of 1982, as amended, of which not to exceed $122,509,900 shall be available for letters of intent issued prior to July 30, 1990: Provided further. That, for each percentage point the amount made available for fiscal year 1991 from the Airport and Airway Trust Fund under sections 505, 506(a), 506(b), and 506(c) of the Airport and Airway Improvement Act of 1982 is less than 75 percent of the aggregate of the amount of funds made available for fiscal year 1991 under sections 505, 506(a), and 506(b) of such Act and the amount of funds made available for fiscal year 1991 for operations of the Federal Aviation Administration, the limitation on commitments shall be reduced by such percentage point but not to an amount less than $1,650,000,000. AVIATION INSURANCE REVOLVING FUND The Secretary of Transportation is hereby authorized to make such expenditures and investments, within the limits of funds available pursuant to section 1306 of the Act of August 23, 1958, as amended (49 U.S.C. 1536), and in accordance with section 104 of the Government Corporation Control Act, as amended (31 U.S.C. 9104), as may be necessary in carrying out the program set forth in the budget for the current fiscal year for aviation insurance activities under said Act. AIRCRAFT PURCHASE LOAN GUARANTEE PROGRAM The Secretary of Transportation may hereafter issue notes or 49 USC app. other obligations to the Secretary of the Treasury, in such forms and 1324 note, denominations, bearing such maturities, and subject to such terms and conditions as the Secretary of the Treasury may prescribe. Such obligations may be issued to pay any necessary expenses required pursuant to any guarantee issued under the Act of September 7, 1957, Public Law 85-307, as amended (49 U.S.C. 1324 note). None of the funds in this Act shall be available for the implementation or execution of programs under this head the obligations for which are
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