How would you address DAL51 if he declares himself to be MEDEVAC?

In air traffic control communication, the proper way to address an aircraft declaring itself as a MEDEVAC (Medical Evacuation) is to prioritize the MEDEVAC designation, which indicates the flight's urgent nature. This urgency necessitates immediate attention and priority routing.

When addressing a MEDEVAC flight, using the term "MEDEVAC" at the start of the call ensures that the urgency of the situation is conveyed promptly to air traffic controllers and other aircraft. By stating "MEDEVAC Delta Fifty One," the identification of the aircraft as a medical emergency is established first, followed by its call sign. This format is consistent with aviation communication protocols, which emphasize clarity and the prioritization of critical situations.

The other choices do not conform to this standard. Starting with the aircraft's call sign or placing it at the end can obscure the urgent nature of the flight, making it less clear to those monitoring communication that this is a priority situation.