The idea is not new, but had never seen the light of day. Today it is a French start-up that wants this innovation to see the light of day. Airseas plans to install a 1000m2 sail, held by a cable 400m in front of the ship, in order to reduce the consumption of ships. This sail would save up to 20% of fuel. A prototype, with a smaller sail, is already at sea on an Airbus cargo ship.