14 C.F.R. § 375.60
The operation of a foreign aircraft within the United States or over adjacent territorial waters in violation of the provisions of this part constitutes a violation of 49 U.S.C. Subtitle VII and of this chapter, and may, in addition, constitute a violation of the rules of the Federal Aviation Administration. Such operation makes the person or persons responsible for the violation or violations subject to a civil penalty as provided in 49 U.S.C. 46301 , and to the alteration, amendment, modification, suspension or revocation of any permit issued under this part and of any U.S. certificate involved as provided in 49 U.S.C. 44709 . Engaging in air transportation as defined in 49 U.S.C. Subtitle VII by a foreign aircraft without a foreign air carrier permit issued pursuant to 49 U.S.C. 41301 or an exemption, or in violation of the terms of such authority constitutes not only a violation of this part but of Title 49, subtitle VII, as well, which entails a criminal penalty as set forth in 49 U.S.C. 46316 .
14 C.F.R. §375.60