The addon I am using is: http://www.armaholic.com/page.php?id=10834
Basically, it adds an action to all kinds of aircraft so you can load and unload vehicles inside the plane or helicopter's cargo area.
If I walk up to the back side of a plane, it has a "Load cargo" action on the plane. I want to make an AI unit walk to the back of the plane, do the "Load cargo" action and then get in and fly the plane to an area by using waypoints and then do the action "Unload cargo". You can unload the cargo as a pilot while airborn, it's part of the script.
I just can't figure out how to make the AI do the plane's added action. That's my main problem.