In the past, we have all seen advertisements in the sky using sky writers or banners behind general aviation planes. There seem to be fewer of them these days, but they may be coming back: thanks to a new drone concept by Spain’s CATUAV. Now, with their partners at the BCN Drone Center, CATUAV has designed and manufactured a drone perfect for pulling banners in the sky – less expensive and easier to see than traditional sky advertising pulled by manned aircraft.