Periodo de entreguerras. Porco es un cerdo aviador que fustra todos los actos de piratería perpetrados por los piratas aéreos del Adriático. Éstos, decididos a acabar con el valiente y hábil Porco, se unen para contratar a un aventurero americano que le elimine de los aires donde las mafias operan

In Italy in the 1930s, sky pirates in biplanes terrorize wealthy cruise ships as they sail the Adriatic Sea. The only pilot brave enough to stop the scourge is the mysterious Porco Rosso, a former World War I flying ace who was somehow turned into a pig during the war. As he prepares to battle the pirate crew's American ace, Porco Rosso enlists the help of spunky girl mechanic Fio Piccolo and his longtime friend Madame Gina.