Mkay. Create your helicopter. Make sure he is flying.In his init line type:
SupportGrp_One = group this
Next, make a move WP directly on top of him. In the On Activation line type
[SupportGrp_One,1] setWPPos (getPos player)
.
Sync a trigger with Activation: Radio Alpha to that WP.
Finally, make an SAD WP close to the chopper.
That should do it.