Which call would indicate a request to change altitude in thousands of feet MSL?

In aviation communication, pilots use specific terms to convey important operational information clearly and efficiently. The term that indicates a request to change altitude in thousands of feet MSL (Mean Sea Level) is "ELEVATOR." This terminology is commonly understood among pilots and air traffic controllers.

The term "ELEVATOR" succinctly conveys the intention behind the request, referring to the aircraft's capability to ascend or descend, much like an elevator in a building moves between floors. Pilots use this call to indicate a specific change to their altitude, allowing for quick comprehension and action by both the pilot and air traffic control.

Other terms listed, while related to altitude or flight path modifications, do not specifically imply a request for altitude changes in the same direct way. "ALTITUDE" is a more general term and may refer to altitude in various contexts without indicating a specific change. "LEVEL CHANGE" refers to a change in altitude and typically is used in automated flight management systems but does not match the requested terminology in this scenario. "FLIGHT PATH" pertains to the trajectory of the aircraft rather than a specific altitude change request.