Which phraseology is used to obtain altitude reports from an aircraft?

The phraseology used to obtain altitude reports from an aircraft is correctly identified as "Report leaving odd altitudes." This specific phrase is pertinent in instances where air traffic control needs to receive information about the altitudes at which an aircraft is transitioning. In aviation communication, using precise and established phraseology ensures clarity and reduces the potential for miscommunication, which can be critical for maintaining safety in controlled airspace.

When air traffic controllers request an aircraft to "report leaving odd altitudes," they are typically asking the pilot to provide information regarding their transition from an altitude that is categorized as odd, which is important for traffic separation and altitude management. This kind of communication helps maintain a safe distance between aircraft operating at different altitudes.

Other phrases, while they may seem relevant, do not specifically convey the intent to gather altitude reports in a way consistent with aviation standards. For example, "Report your current flight level" could suggest a request for the aircraft's present altitude but does not address transitions or changes in altitude. Similarly, "Say altitude" and "Request altitude information" are less formal and not standard phraseology used in communications with air traffic control, potentially leading to misunderstandings in the critical context of altitude reporting. Therefore, the chosen phrase remains the most appropriate