There are indeed a couple of chopper shots in the Un-Impossible Mission using Blanco's script. It took a bit of experimenting to the the positions right but it wasn't hard, just a little tedious.
You know there are two gamelogics? One for the camera position and one for the camera target? Getting the target one right is harder than getting the camera position correct.
Relevant bit from the script to save you the d/l:-
; inside chopper
[_camera,chopper2,[180,0.1,2],chopper2,[0,8,-1],0.7] exec "logiccam.sqs"
~6
; destroy and create camera (necessary after logiccam for some reason)
_camera cameraeffect ["terminate", "back"]
camdestroy _camera
_camera = "camera" camcreate [0,0,0]
_camera cameraeffect ["internal", "back"]
This was for an internal passenger compartment view of a Hip, obviously named chopper2.