The Attorney General is authorized (1) by regulation to designate as ports of entry for aliens arriving by aircraft any of the ports of entry for civil aircraft designated as such in accordance with law; (2) by regulation to provide such reasonable requirements for aircraft in civil air navigation with respect to giving notice of intention to land in advance of landing, or notice of landing, as shall be deemed necessary for purposes of administration and enforcement of this chapter; and (3) by regulation to provide for the application to civil air navigation of the provisions of this chapter where not expressly so provided in this chapter to such extent and upon such conditions as he deems necessary. Any person who violates any regulation made under this section shall be subject to a civil penalty of $2,000 which may be remitted or mitigated by the Attorney General in accordance with such proceedings as the Attorney General shall by regulation prescribe. In case the violation is by the owner or person in command of the aircraft, the penalty shall be a lien upon the aircraft, and such aircraft may be libeled therefore in the appropriate United States court. The determination by the Attorney General and remission or mitigation of the civil penalty shall be final. In case the violation is by the owner or person in command of the aircraft, the penalty shall be a lien upon the aircraft and may be collected by proceedings in rem which shall conform as nearly as may be to civil suits in admiralty. The Supreme Court of the United States, and under its direction other courts of the United States, are authorized to prescribe rules regulating such proceedings against aircraft in any particular not otherwise provided by law. Any aircraft made subject to a lien by this section may be summarily seized by, and placed in the custody of such persons as the Attorney General may by regulation prescribe. The aircraft may be released from such custody upon deposit of such amount not exceeding $2,000 as the Attorney General may prescribe, or of a bond in such sum and with such sureties as the Attorney General may prescribe, conditioned upon the payment of the penalty which may be finally determined by the Attorney General.