Kurenai no Buta, Ouritsu Uchuugun: Honneamise no Tsubasa Recommendations
Both stories share the theme of flight and carefully detail the hand-making of a flying machine. They are also similar in their realism and subtlety. The Wings of Honneamise is hard sci-fi while Porco Rosso follows a lighthearted (yet mature) fantasy. Bottom line: both are old school classics that can't be missed!