GTA San andreas - Flying in Circles

To do this trick, first go to the crane(that you use for exporting and importing vehicles) and attatch it to your car ( any car should do i think )

Then do the flying car cheat (Up, Down, L1, R1, L1, Right, Left, L1, Left)

Now try to drive as fast as you can away from the crane, if done correctly your car will go a little ways into the air, and then you should be able to start flying around in circles (it could take a little bit of adjusting to the crane so that you won't hit anything)