19 CFR § 4.50 - Passenger lists.
(a) The master of every vessel arriving at a port of the United States from a port or place outside the Customs territory (see § 4.6 of this part) and required to make entry, except a vessel arriving from Canada, otherwise than by sea, at a port on the Great Lakes, or their connections or tributary waters, shall submit passenger and crew lists, as required by § 4.7(a) of this part.
(b) A passenger within the meaning of this part is any person carried on a vessel who is not connected with the operation of such vessel, her navigation, ownership, or business.
(c) By the act of submitting the data elements required on CBP Form I–418 via an electronic data interchange system approved by CBP, the master certifies that CBP baggage declaration requirements have been made known to incoming passengers; that any required CBP baggage declarations have been or will simultaneously be filed as required by law and regulation with the proper CBP officer; that the responsibilities of the vessel operator have been or will be done as required by law or regulation before the proper CBP officer; and that there are no steerage passengers on board the vessel.