Which prefix is used to initiate a Departure Message for N100WM?

Which prefix is used to initiate a Departure Message for N100WM?

• A. DM
• B. AM
• C. FP
• D. FR

Answer: (A)

The key idea is that a Departure Message is identified by a prefix that signals departure-related coordination. The prefix used for this is DM, which stands for Departure Message. Placing DM before the aircraft’s registration (N100WM) marks the message as specifically about initiating departure—guidance, routing, timing, and other departures details. This makes it clear to the controller and the system that the content concerns leaving the field, rather than arriving, planning, or releasing. In practice you’d see DM N100WM to start the departure message, followed by the relevant details.

The key idea is that a Departure Message is identified by a prefix that signals departure-related coordination. The prefix used for this is DM, which stands for Departure Message. Placing DM before the aircraft’s registration (N100WM) marks the message as specifically about initiating departure—guidance, routing, timing, and other departures details. This makes it clear to the controller and the system that the content concerns leaving the field, rather than arriving, planning, or releasing. In practice you’d see DM N100WM to start the departure message, followed by the relevant details.