Yes, there is a getin command (check the command reference for more), but I dont' think it's necessary unless there's more to the setup than I can tell...
My suggestion is to delete your getin waypoint, then make a new one while zoomed in on the chopper.. Make sure you make the waypoint directly on the chopper for it to work. YOu will know you are successful if you cannot move that waypoint anymore.
Hope that helps! ;D
Asmodeus