What is necessary for a flight returning from an international destination entering the US?

For a flight returning from an international destination to the United States, a paper version of a customs form is necessary. This requirement exists to ensure that travelers declare any items they have brought into the country that may be subject to customs duties or restrictions. The paper customs form helps customs officials assess the nature of the items being imported and facilitates the proper processing of these goods at the border.

While digital customs forms are becoming more prevalent, the official requirement still emphasizes the importance of the traditional paper version, ensuring all passengers can comply regardless of their access to technology.

The other options do not meet the necessary legal requirements for entry into the U.S.; thus, the paper customs form serves as a crucial document in the customs process for international travelers.