105 STAT. 838 PUBLIC LAW 102-141—OCT. 28, 1991 which a minimum level of 960 full-time equivalent positions shall be allocated to air interdiction activities of the United States Customs Service, and of which a minimum level of 10,480 full-time equivalent positions shall be allocated to commercial operations activities: Provided further. That no funds appropriated by this Act may be used to reduce to single eight hour shifts at airports and that all current services as provided by the Customs Service shall continue through September 30, 1992: Provided further, That not less than $500,000 shall be expended for additional part-time and temporary positions in the Honolulu Customs District. OPERATION AND MAINTENANCE, AIR AND MARINE INTERDICTION PROGRAMS For expenses, not otherwise provided for, necessary for the hire, lease, acquisition (transfer or acquisition from any other agency), operation and maintenance of marine vessels, aircraft, and other related equipment of the Air and Marine Programs; $175,932,000, of which $14,500,000 shall not be obligated prior to September 30, 1992, to remain available until expended: Provided, That no aircraft or other related equipment shall be transferred to any other Federal agency, department, or office outside of the Department of the Treasury during fiscal year 1992. CUSTOMS AIR INTERDICTION FACILITIES, CONSTRUCTION, IMPROVEMENTS AND RELATED EXPENSES For acquisition of necessary additional real property, facilities construction, improvements, and related expenses of the United States Customs Service Air Interdiction Program, $12,100,000, to remain available until expended. CUSTOMS FORFEITURE FUND (LIMITATION ON AVAILABILITY OF DEPOSITS) For necessary expenses of the Customs Forfeiture Fund, not to exceed $15,000,000, as authorized by Public Law 100-690, as amended by Public Laws 101-382 and 101-508; to be derived from deposits in the Fund. CUSTOMS SERVICES AT SMALL AIRPORTS (TO BE DERIVED FROM FEES COLLECTED) Such sums as may be necessary, not to exceed $2,981,000, for expenses for the provision of Customs services at certain small airports or other facilities when authorized by law and designated by the Secretary of the Treasury, including expenditures for the salary and expenses of individuals employed to provide such services, to be derived from fees collected by the Secretary of the Treasury pursuant to section 236 of Public Law 98-573 for each of these airports or other facilities when authorized by law and designated by the Secretary of the Treasury, and to remain available until expended.