Both the Playstation 2 and Windows PC game version was planned to be released but was canceled leaving only the Nintendo Gamecube version to be released.
Due to the poor sales of this game. This makes it one of the most expensive Gamecube games ever due to it being a rare hard to find game.
The sequel to Skies of Arcadia was planned and was going be called Skies of Arcadia 2 but the Sega team canceled it due to poor sales of Skies of Arcadia.