22 CFR §123.11

1. (a)A license issued by the Directorate of Defense Trade Controls is required whenever a privately-owned aircraft or vessel on the U.S. Munitions List makes a voyage outside the United States.
2. (b)Exemption. An export license is not required when a vessel or aircraft referred to in paragraph (a) of this section departs from the United States and does not enter the territorial waters or airspace of a foreign country if no defense articles are carried as cargo. Such a vessel or aircraft may not enter the territorial waters or airspace of a foreign country before returning to the United States, or carry as cargo any defense article, without a temporary export license (Form DSP-73) from the Department of State. (See § 123.5.)