"Airship" is not in the list (Battleship, Cruiser, Heavy Cruiser, Light Cruiser, Destroyer, Carrier, Transport, Escort Ship, Mother-ship, Frigate, ...) of allowed values for the "Ship Type" property. The Damocles is an airship in the series Mobile Fighter G Gundam.
A luxury airship of Neo France, the Damocles was used by the nation's royal family and ranking officials to observe the proceedings of the 13th Gundam Fight. Most of the vessel's footprint was made up of three enormous balloons, which in turn mounted a series of propellers for navigation and propulsion. The elaborate canopy suspended by these balloons was dominated by a sizable observation deck, with two levels of VIP suites behind it.