The one used by The Trail Magician Lord Johann looks like a bird with out spread black wings that flap while its in flight. The cockpit in the center has a round glass window. It flies as a speed unimaginable for its stocky form.
There is one in the Iron Castle that was piloted by the Confessor. Its described as a red delta-wing aircraft with the person piloting it seated in the center protruding from it. It's made of the Nobility's supreme metal alloys. D attempts to cut it but can only slice a blot from it's frame.