The DEMON uses output from the jets to control airflow over the plane, manipulating lift and drag without using traditional mechanisms to steer. Its developers believe the technology could revolutionize the stealth capabilities of military aircraft by reducing edges and gaps that can be picked up on radar. The technology could also reduce fuel and maintenance costs for commercial airliners. Professor John Fielding, chief engineer and lead for the DEMON demonstrator team from Cranfield University, said: ''To make an aircraft fly and maneuver safely without the use of conventional control surfaces is an achievement in itself. The DEMON was developed...