Which message indicates that RPA46 departed at 1815?

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Multiple Choice

Which message indicates that RPA46 departed at 1815?

Explanation:
In this kind of message system, the prefix shows what happened to the aircraft. DM stands for a departure message, which indicates the aircraft has left, followed by the aircraft identifier and the time of departure. So a message that starts with the departure prefix, then the tail number, then the time, clearly communicates that the aircraft departed at that time. The other formats either indicate arrival (AM) or place the time in a position that doesn’t align with a departure report, so they don’t signal a departure event as clearly. Therefore, the message that properly conveys the departure is the one with the departure indicator, the aircraft RPA46, and the time 1815.

In this kind of message system, the prefix shows what happened to the aircraft. DM stands for a departure message, which indicates the aircraft has left, followed by the aircraft identifier and the time of departure. So a message that starts with the departure prefix, then the tail number, then the time, clearly communicates that the aircraft departed at that time.

The other formats either indicate arrival (AM) or place the time in a position that doesn’t align with a departure report, so they don’t signal a departure event as clearly. Therefore, the message that properly conveys the departure is the one with the departure indicator, the aircraft RPA46, and the time 1815.

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