A vehicle having a first configuration for road use and a second configuration for air use, comprising: road wheels; a traction drive propulsion unit for driving road wheels when in contact with the ground; a thrust propulsion unit for driving a propeller to drive the vehicle through the air; and wherein, when the vehicle is configurable into any of: the first configuration, in which the traction drive propulsion unit is engaged to drive the road wheels on the ground, and the thrust propulsion unit is disengaged from the propeller; the second configuration, in which the traction drive propulsion unit is disengaged such that no drive is provided to the road wheels, and the thrust propulsion unit is engaged with the propeller to drive the vehicle thorough the air; or an intermediate configuration in which the traction drive propulsion unit is engaged to drive the road wheels on the ground, and the thrust propulsion unit is engaged with the propeller to drive the vehicle through the air. A method of operating the vehicle comprises: placing the vehicle in the intermediate configuration with the road wheels in contact with the ground; operating the thrust propulsion unit to drive the propeller, and simultaneously operating the traction drive propulsion unit to drive the wheels, so as to accelerate the vehicle to a predetermined airspeed; and disengaging the traction drive propulsion unit such that no drive is provided to the road wheels, and the propeller drives the vehicle thorough the air.