Who is responsible for requesting a high altitude approach if an enroute descent is not desired?

The pilot is responsible for requesting a high altitude approach if an enroute descent is not desired. This is because the pilot is in command of the aircraft and has the ultimate authority and responsibility for its operation. The decision to maintain altitude or request a specific approach type requires an understanding of the flight path, the current flight conditions, and the overall mission objectives.

The pilot communicates with Air Traffic Control (ATC) to convey their intentions and any specific requests for altitude adjustments during approach. While co-pilots and the rest of the flight crew assist in the flying and decision-making process, it is the pilot who officially engages with ATC regarding changes to the flight plan, including approaches. This ensures that the flight is safely managed in accordance with air traffic procedures and regulations.