31 CFR § 560.406 - Transshipment or transit through the United States.
(a) The prohibitions in § 560.201 apply to the importation into the United States, for transshipment or transit, of Iranian-origin goods or goods owned or controlled by the Government of Iran which are intended or destined for third countries.
(b) The prohibitions in § 560.204 apply to the transshipment or transit of foreign goods through the United States which are intended or destined for Iran or the Government of Iran, including entities owned or controlled by the Government of Iran.
(c) Goods in which the Government of Iran, any Iranian financial institution, or any other person whose property and interests in property are blocked pursuant to § 560.211 has an interest which are imported into or transshipped through the United States are subject to the prohibitions in § 560.211.