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.