Thanks StevieB
As i said - this post was before I read all the forums - plus - just new to map making.
In any event - I had tried before to just set speed to Zero. When the chopper reached it's final wp and I wanted it to land - it just sat there hovering like the patient little AI it was. So i was probably doing something else wrong somewhere.
I also just tried the change AI state to follow wp then directed it to the desired WP.
It works for me. Probably not pretty on a programming level but gets the desired result.
So hopefully I haven't given anyone bad advice. This worked for me and got the results I wanted. As I develop in map making skills I'm sure I'll get better thanks to forums like these.