Easy way to blow up police copters
Ok, go to Jefferson and do the Jetpack cheat(Left, Right, L1, L2, R1, R2, Up, Down, Left, Right)and go to the highest point of Jeffersons hospital. Ok, when you are at the top of the hospital tahe the sniper rifle. If you wanna use sniper rifle, well you can use it, but I use rocket launcher. Or simply do the blow up all cars cheat(R2, L2, R1, L1, L2, R2, Square, Triangle, Circle, Triangle, L2, L1).