Well if the chopper you have is to land try in the waypoint where you want it to land civvi1 land "land"
I think that's how it goes.... :-\
But if you have crago to unload at each place go like this.
I assume you can get ppl in the chopper from the start. Make the heli a transport unload waypoint at first destination. Then another one at second destination and another transport unload at third destination. Finally make a cycle waypoint and put it close to the first transport unload waypoint. Closer to that one than any other. The chopper should fly to first destination and unload everyone ( it may be harder to unload specific ppl at specific places) Then it goes to 2nd place and lands or it should(I'm not sure wat chopper does when no one to transport unload on board does) Then goes to third place (should land) And moves on to first waypoint to do it again and again unitl its shot down or runs out of fuel.
Remeber that chopper load waypoints and get in waypoints have to be sychronized.
Hope that was detailed enough.....