Which form should the N1 complete at the end of each day?

The correct choice is the in-flight report. This report is crucial for documenting the events and operations that occurred during a particular flight. The N1, which typically refers to the lead cabin crew member or officer, is responsible for ensuring that all relevant information is accurately captured for the reference of the crew and airline management.

The in-flight report includes data about passenger services, any incidents or irregularities, and overall performance metrics. This information is vital not only for compliance and safety records but also for enhancing future flight operations. By completing the in-flight report at the end of each day, the N1 ensures that all necessary details are recorded while the events are still fresh, which contributes to better operational oversight and service improvement strategies for the airline.

The other forms mentioned, while important in their own contexts, do not specifically fulfill the same purpose as the in-flight report in the daily operational assessment of flights.