Unlike other aircraft, the DEMON UAV is "the first to control its elevation using jets of air; the plane works by manipulating the air that flows immediately next to its skin, rather than changing its shape." Video after the break.
Jets of air close to the trailing edge of the wing change whether the air moves away from or towards the wing. Sensors along the wing constantly monitor the airflow and can adjust the direction of the jets of air.[via Dailymail]