; and purchase, lease, charter, maintenance, and operation of mission and administrative aircraft, $3,100,000,000, to remain available until September 30, 2025: Provided, That if available balances in the Science, Space, and Technology Education Trust Fund are not sufficient to provide for the grant disbursements required under the third and fourth provisos under such heading in the Department of Housing and Urban Development-Independent Agencies Appropriations Act, 1989 ( Public Law 100–404 ) as amended by the Departments of Veterans Affairs and Housing and Urban Development, and Independent Agencies Appropriations Act, 1995 ( Public Law 103–327 ), up to $1,000,000 shall be available from amounts made available under this heading to make such grant disbursements: Provided further, That of the amounts appropriated under this heading, $20,978,000 shall be used for the projects, and in the amounts, specified in the table titled NASA Special Projects in the report accompanying this Act: Provided further, That the amounts made available for the projects referenced in the preceding proviso may not be transferred for any other purpose. CONSTRUCTION AND ENVIRONMENTAL COMPLIANCE AND RESTORATION For necessary expenses for construction of facilities including repair, rehabilitation, revitalization, and modification of facilities, construction of new facilities and additions to existing facilities, facility planning and design, and restoration, and acquisition or condemnation of real property, as authorized by law, and environmental compliance and restoration, $379,000,000, to remain available until September 30, 2029: Provided, That of the amounts made available under this heading, $296,000,000 is designated by the Congress as being for an emergency requirement pursuant to section 251(b)(2)(A)(i) of the Balanced Budget and Emergency Deficit Control Act of 1985: Provided further , That proceeds from leases deposited into this account shall be available for a period of 5 years to the extent and in amounts as provided in