Transporting one hundred thousand dollars in cash on an aircraft is entirely legal from a civil liberties standpoint, but it subjects travelers to strict regulatory oversight and potential law enforcement scrutiny. For domestic flights within the United States, airport security screeners do not enforce a strict ceiling on carrying cash; however, if a significant amount of currency is flagged during baggage screening, local or federal authorities may investigate to ensure the money is not tied to illicit activities. When embarking on international flights, passengers must declare any amount over ten thousand dollars to customs officials upon departure or arrival. Transparent compliance prevents asset forfeiture and legal complications.