When is liquor specifically required to be locked?

Liquor is specifically required to be locked when going to or from an international destination primarily due to regulatory requirements and safety protocols. International flights often involve stricter guidelines concerning the transportation of alcohol, including the need to prevent unauthorized access. This is implemented to ensure compliance with the laws of various countries, as some destinations have specific restrictions on the amount of alcohol an individual can bring in or the manner in which it can be stored and accessed.

In comparison, domestic flights have different protocols that may not necessitate the same level of oversight regarding liquor storage, as national regulations can be less stringent. Additionally, locking liquor every time an aircraft lands or only during turbulence are situations that do not inherently require the same regulatory compliance as when traveling internationally, where the potential for a broader range of legal implications exists. Hence, the need for locking liquor is not uniformly applied in all scenarios, but is emphasized particularly in the context of international travel.