Hey Crowcoll, I map for DF2(as it is the best of the series)...
anyways it should run the same basis.
Lay down your waypoints first, make sure they run on a clearing that is realistically long enough for a runway
Then towards the last few waypoints start raising the z level. Then select all the waypoints set them as list 1, then number them in sequential order 0-whatever. That will cause the plane to move off the ground.
Now to make it move select the plane and set it for group 3, go to events and set it as follows:
if group 3 is still alive, then redirect group 3 to waypoint list 1, and set group velocity to (whatever speed you wish).
that will cause the plane to fly that same route non stop as soon as the map loads.
hopefully now you can figure out patterns and make the plane do what you want specifically.