Final answer:
ACP stands for Airspace Control Plan in reference to air routes. It is a document that outlines the establishment and control of airspace.
Step-by-step explanation:
ACP stands for Airspace Control Plan in reference to air routes. An Airspace Control Plan is a document that outlines the establishment and control of airspace, including air routes, within a particular region or country. It provides guidelines for the use of airspace, including altitudes, routes, and restrictions, to ensure the safe and efficient movement of aircraft.