Residue cargo. Residue cargo is any cargo on board an aircraft arriving in the U.S. from a foreign area if the:
(1) Final delivery airport in the U.S. is not the port of arrival; or
(2) Cargo remains on board the aircraft and travels from port to port in the U.S., for final delivery in a foreign area.
19 CFR § 122.1
The following definitions apply in this part, unless otherwise stated: