22 CFR §120.51

1. (a)Reexport, except as set forth in § 120.54 or § 126.16 or § 126.17 of this subchapter, means:
   1. (1)An actual shipment or transmission of a defense article from one foreign country to another foreign country, including the sending or taking of a defense article to or from such countries in any manner;
   2. (2)Releasing or otherwise transferring technical data to a foreign person who is a citizen or permanent resident of a country other than the foreign country where the release or transfer takes place (a deemed reexport); or
   3. (3)Transferring registration, control, or ownership of any aircraft, vessel, or satellite subject to this subchapter between foreign persons.
2. (b)Any release outside the United States of technical data to a foreign person is deemed to be a reexport to all countries in which the foreign person has held or holds citizenship or holds permanent residency.