You can make static builds out of bricks, or place Vehicle Spawns to create several pre-made vehicles. You can add extra vehicles through Add-Ons: installing the Stunt Plane (made by Kaje) and enabling it in the Add-Ons menu would let you create a three-seater basic plane to fly.
you cant use add-ons in the demo though
Have you tried?
Badspot had said you can't, so i thought you couldn't.
He has never said that as far as I know.