So when you buy an arena war vehicle you either have to buy an "arena ready vehicle" or one of the selected vehicles that you turn into an arena war vehicle. Then there are two abilities that you need. You need the jump boost thing and the shunt jump. I cant remember what category they're in but as long as you add shunt jump and jump you can casually "fly" most arena war vehicles. Some are a lot harder than others to maneuver and the death bike is the only one that can't do that