Which message indicates that UAL10 has departed?

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Multiple Choice

Which message indicates that UAL10 has departed?

Explanation:
In this context, the status of an aircraft leaving the field is indicated by a Departure Message that simply pairs the DM tag with the flight designator. Seeing DM UAL10 clearly tells you that UAL10 has departed because it’s the concise status update that denotes departure without adding other data. The other formats include extra elements—like a code, a destination, or the explicit word “DEPARTURE”—which aren’t necessary for signaling departure in this specific signaling convention and could be used for different pieces of information or procedures.

In this context, the status of an aircraft leaving the field is indicated by a Departure Message that simply pairs the DM tag with the flight designator. Seeing DM UAL10 clearly tells you that UAL10 has departed because it’s the concise status update that denotes departure without adding other data. The other formats include extra elements—like a code, a destination, or the explicit word “DEPARTURE”—which aren’t necessary for signaling departure in this specific signaling convention and could be used for different pieces of information or procedures.

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