14 CFR 129.13 - Airworthiness and registration certificates.
(a) No foreign air carrier may operate any aircraft within the United States unless that aircraft carries a current registration certificate and displays the nationality and registration markings of the State of Registry, and an airworthiness certificate issued or validated by:
(1) The State of Registry; or
(2) The State of the Operator, provided that the State of the Operator and the State of Registry have entered into an agreement under Article 83bis of the Convention on International Civil Aviation that covers the aircraft.
(b) No foreign air carrier may operate a foreign aircraft within the United States except in accordance with the limitations on maximum certificated weights prescribed for that aircraft and that operation by the country of manufacture of the aircraft.