((a)) ** .—** Local taxes on aviation fuel (except taxes in effect on ) or the revenues generated by an airport that is the subject of Federal assistance may not be expended for any purpose other than the capital or operating costs of—
((1)) the airport;
((2)) the local airport system; or
((3)) any other local facility that is owned or operated by the person or entity that owns or operates the airport that is directly and substantially related to the air transportation of passengers or property.
((b))
((1)) ** .—** Subsection (a) shall not apply if a provision enacted not later than , in a law controlling financing by the airport owner or operator, or a covenant or assurance in a debt obligation issued not later than , by the owner or operator, provides that the revenues, including local taxes on aviation fuel at public airports, from any of the facilities of the owner or operator, including the airport, be used to support not only the airport but also the general debt obligations or other facilities of the owner or operator.
((2)) ** .—** In the case of a privately owned airport, subsection (a) shall not apply to the proceeds from the sale of the airport to a public sponsor if—
((A)) the sale is approved by the Secretary;
((B)) funding is provided under this subchapter for any portion of the public sponsor’s acquisition of airport land; and
((C)) an amount equal to the remaining unamortized portion of any airport improvement grant made to that airport for purposes other than land acquisition, amortized over a 20-year period, plus an amount equal to the Federal share of the current fair market value of any land acquired with an airport improvement grant made to that airport on or after , is repaid to the Secretary by the private owner.
((3)) ** .—** Repayments referred to in paragraph (2)(C) shall be treated as a recovery of prior year obligations.
((c)) ** .—** Nothing in this section may be construed to prevent the use of a State tax on aviation fuel to support a State aviation program or the use of airport revenue on or off the airport for a noise mitigation purpose.