Which document is necessary to ensure proper completion of the flight departure process?

The completion of customs and/or international flight departure forms is essential to ensure that all legal requirements are met when an aircraft departs for an international destination. These forms are specifically designed to comply with the laws and regulations governing international travel, including passport checks, customs declarations, and any other legalities pertaining to the departure of flights crossing international borders. Filling out these forms correctly helps avoid issues at departure and arrival points, ensuring a smooth process for both the airline and its passengers.

The other documents mentioned play significant roles in flight operations. For instance, a passenger manifest is important for tracking who is on board, and a flight plan is necessary for navigation and air traffic control purposes. Meanwhile, an aircraft maintenance report is critical for safety and regulatory compliance. However, none of these documents directly address the specific legal and customs requirements associated with international departures, making the customs and/or international flight departure forms the necessary document in this context.