What is the correct phraseology for a handoff involving SWA35 at FL190?

The correct phraseology is a crucial aspect of air traffic control communication, ensuring clarity and accuracy when relaying information to pilots. The phraseology states the distance from a prominent reference point, the aircraft's call sign, and its altitude in a format that is standardized.

In this context, the phraseology “Handoff five zero miles southwest of OKC, Southwest thirty-five, flight level one niner zero” effectively communicates that the aircraft, Southwest 35, is being handed off at a specified distance and direction from Oklahoma City (OKC). It correctly uses "five zero" to indicate the distance in miles, which conforms with established practices for distance reporting in aviation.

Furthermore, it specifies the correct altitude using the term "flight level one niner zero," which is the appropriate terminology for conveying altitude in reference to the standard atmosphere. This Level includes terrain and ensures that there is no ambiguity regarding what altitude the aircraft is at during the handoff.

In contrast, the other options either incorrectly state the distance from OKC or use non-standard phrasing that would not be suitable for official communication. For instance, using "northeast" or variations like "zero miles" could create confusion, as they do not align with the required specifications for