49 U.S.C. § 46307: Violation of national defense airspace

A person that knowingly or willfully violates section 40103(b)(3) of this title or a regulation prescribed or order issued under section 40103(b)(3) shall be fined under title 18, imprisoned for not more than one year, or both. If a person is convicted of a second or subsequent offense under this section, the punishment shall be imprisonment for not more than 5 years, a fine under title 18, or both.