You use gun the Hunter by SPACE BAR.You can use the missiles by CTRL or the LMB Left Mouse Button.
There is no cheat for any helicopter in GTA Vice City.
AVI
helicopterfly
jackbot
americanhelicopter
There is no cheat for helicopter in GTA Vice City.You can get helicopter in the city at several places.
At the airport
There is no such cheat.
No there is not.
jumbojet
you cant.
HELICOPTER