49 U.S.C. § 44109: Reporting transfer of ownership

(a) Filing Notices.—A person having an ownership interest in an aircraft for which a certificate of registration was issued under section 44103 of this title shall file a notice with the Secretary of the Treasury that the Secretary requires by regulation, not later than 15 days after a sale, conditional sale, transfer, or conveyance of the interest. (b) Exemptions.—The Secretary—(1) shall prescribe regulations that establish guidelines for exempting a person or class from subsection (a) of this section; and (2) may exempt a person or class under the regulations.