My friens call me superman cause I always come to their rescue when they have problems. They even presented me with a sweater where superman logo is printed. It turned out that this logo is like a knight's coat of arms. So, I am a modern knight, hey-hey!
Helicopters are in the game and you have to fly it in a few missions, you can buy one at a safehouse and you can steal some.
Everyone else is lying, but there is a cheat just look on wikigta (search google for it)
hope that helped :)