Sky ferries were tiny sky ships used in Undertown to cross over the Edgewater River. Instead of being kept aloft by a full flight-rock, sky ferries got their buoyancy from flight-rock rubble cages. During the events of Clash of the Sky Galleons, Quint, Maris, and Wind Jackal took a sky ferry across the Edgewater River while traveling to the Sky Shipyards to collect the repaired Galerider. They befriended the pilot, Duggin, who later signed on with their crew.