Except as provided by section
47524 of this title, this subchapter does not affect—
(1)law in effect on November 5, 1990, on airport noise or access restrictions by local authorities;
(2)any proposed airport noise or access restriction at a general aviation airport if the airport proprietor has formally initiated a regulatory or legislative process before October 2, 1990; or
(3)the authority of the Secretary of Transportation to seek and obtain legal remedies the Secretary considers appropriate, including injunctive relief.