As I guess many people here are/have playing/played Arma 3.
It is a game with a mutch better control of your Helicopter.
I personally use a Arma 2 style setup for flying.
So I decided to add this into my GTA V.
Here is how I have my settings.
(Keep in mind this aims for better Helicopter flying not flying a Plane)
The only things that metter in this picture is the section Aircraft Throttle Up to Aircraft Pitch Back. Set the rest to were you want :D
If I was able to help please send this to friends so they don't crash so mutch while flying :D
-NOE