49 U.S.C. § 47529 — Nonaddition rule

(a) General limitations. Except as provided in subsection (b) of this section and section 47530, a person may operate a civil subsonic turbojet aircraft weighing more than 75,000 pounds that was imported into the United States after November 4, 1990, only if either (1) the aircraft complies with the stage 3 noise levels, or (2) the person importing it bought it under a legally binding contract made before November 5, 1990. (b) Exemptions. The Secretary of Transportation may provide an exemption from subsection (a) to allow a person to obtain modifications to an aircraft so that it meets the stage 3 noise levels. (c) Aircraft deemed not imported. For this section, an aircraft is treated as not having been imported into the United States if (1) on November 5, 1990, it was owned by (A) a corporation, trust, or partnership organized under United States law or the law of a State, including the District of Columbia; (B) an individual who is a United States citizen; or (C) an entity owned or controlled by a corporation, trust, partnership, or individual described in subclause (A) or (B); and (2) it enters the United States no later than six months after a lease agreement, including any extension, expires between an owner described in paragraph (1) and a foreign carrier.