Which type of aircraft information is not required for military or scheduled air carriers?

The correct choice reflects that the estimated time of arrival (ETA) at destination is not a mandatory requirement for military or scheduled air carriers. The operational environment of these carriers typically involves predefined flight schedules where departure and arrival times are strictly controlled and anticipated based on established flight plans. Therefore, while an ETA might be helpful in some contexts, it is not mandated for flight operations.

In contrast, information such as the assigned beacon code, point of departure, and aircraft ID is crucial for flight safety, navigation, and coordination with air traffic control. The assigned beacon code helps in identifying and tracking aircraft, the point of departure is essential for establishing the flight's origin, and the aircraft ID is critical for ensuring accurate communication and recognition of individual flights within the airspace system. This fundamental information contributes to maintaining safety, efficiency, and orderly conduct in various air operations.