49 USC 47529 – Nonaddition rule
(a)
(1) complies with the stage 3 noise levels; or
(2) was purchased by the person importing the aircraft into the United States under a legally binding contract made before November 5, 1990.
(b)
(c)
(1) was owned on November 5, 1990, by—
(A) a corporation, trust, or partnership organized under the laws of the United States or a State (including the District of Columbia);
(B) an individual who is a citizen of the United States; or
(C) an entity that is owned or controlled by a corporation, trust, partnership, or individual described in subclause (A) or (B) of this clause; and
(2) enters the United States not later than 6 months after the expiration of a lease agreement (including any extension) between an owner described in clause (1) of this subsection and a foreign carrier.