19 U.S.C. § 1433 : US Code - Section 1433: Report of arrival of vessels, vehicles, and aircraft

    (a) Vessel arrival
      (1) Immediately upon the arrival at any port or place within the
    United States or the Virgin Islands of - 
        (A) any vessel from a foreign port or place;
        (B) any foreign vessel from a domestic port;
        (C) any vessel of the United States carrying foreign
      merchandise for which entry has not been made; or
        (D) any vessel which has visited a hovering vessel or received
      merchandise while outside the territorial sea;

    the master of the vessel shall report the arrival at the nearest
    customs facility or such other place as the Secretary may prescribe
    by regulations.
      (2) The Secretary may by regulation - 
        (A) prescribe the manner in which arrivals are to be reported
      under paragraph (1); and
        (B) extend the time in which reports of arrival must be made,
      but not later than 24 hours after arrival.
    (b) Vehicle arrival
      (1) Vehicles may arrive in the United States only at border
    crossing points designated by the Secretary.
      (2) Except as otherwise authorized by the Secretary, immediately
    upon the arrival of any vehicle in the United States at a border
    crossing point, the person in charge of the vehicle shall - 
        (A) report the arrival; and
        (B) present the vehicle, and all persons and merchandise
      (including baggage) on board, for inspection;

    to the customs officer at the customs facility designated for that
    crossing point.
    (c) Aircraft arrival
      The pilot of any aircraft arriving in the United States or the
    Virgin Islands from any foreign airport or place shall comply with
    such advance notification, arrival reporting, and landing
    requirements as the Secretary may by regulation prescribe.
    (d) Presentation of documentation
      The master, person in charge of a vehicle, or aircraft pilot
    shall present, or transmit pursuant to an electronic data
    interchange system, to the Customs Service such information, data,
    documents, papers, or manifests as the Secretary may by regulation
    prescribe.
    (e) Prohibition on departures and discharge
      Unless otherwise authorized by law, a vessel, aircraft or vehicle
    after arriving in the United States or Virgin Islands may, but only
    in accordance with regulations prescribed by the Secretary - 
        (1) depart from the port, place, or airport of arrival; or
        (2) discharge any passenger or merchandise (including baggage).