this helpful hint will let you fly as far as the map will go with the rhino tank!
first you need the rhino tank.

Spawn A Rhino tank
Circle, Circle, L1, Circle, Circle, Circle, L1, L2, R1, Triangle, Circle,
Triangle

second you need to activate the Dodo cheat

Dodo Cheat
Right, R2, Circle, R1, L2, Down, L1, R1

First find a road that is relatively long that goes to the other island or some other destination turn the turret all the way so it is pointing twords you. hit the gas while simultaneously firing the cannon, when you start to fly don't stop firing and you can keep flying. but don't try to turn because your tank is like a floating paper plate if you go sideways you will start to fall. just keep it strait and if you start to fall and your hight up point downwards then pull up like a glider.

Have fun with it!
JMAN