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Spotter Planes are aircrafts from Andros whose appearance is similar to a boat's. In Valtor's Mark, mermaids saved by Aisha were sent to one Spotter Plane for safety.
In The Fall of Magix, Diaspro and several soldiers armed with magic crossbows went to Red Fountain to try rescuing Sky in such a battleship and dropped a ladder from it. When Sky refused to stop fighing and cut the ladder, the battleship flew away.
Its main door slides when the battleship opens.