At first glance, the Aderyn looks like a drifting cloud banded with brass. For indeed, the ship's envelope was charmed to appear like a large cloud to aid in concealing the flying vehicle as it transports students to and from Penwick. Three tall white sails extend from the top. Beneath hangs a compact brass-and-glass gondola, small outside but expanded within by powerful enchantments.
Inside, the gondola opens into the Grand Saloon, a wide, bright hall lined with tall windows. Older students crowd the best seats to catch up with friends, while first-years press eagerly to the glass for their first view of the castle. At the center stands a rounded concessions counter where a brass automaton sells cocoa, tea, butterbeer, endless plates of biscuits and pasties, and other wizarding sweets. Stools, tables, and couches fill the room, which is never quiet for those too late to snag a seat at the concession counter's circular bar.
A grand oak staircase leads to the lower deck, lined with private compartments, and to the upper deck, a quiet glass-domed promenade where students lean against curved railings to watch the world fall away beneath them.