Hikōtei Jidai(飛行艇時代, lit. The Age of the Flying Boat) is a fifteen-page, all-watercolor manga, on which the animated film "Porco Rosso" is based. It was published in Model Graphix in three parts, a monthly magazine about scale models, as a part of Hayao Miyazaki's "Zassou Note" series. Like other manga in this series, "Hikōtei Jidai" is a manifestation of his love for old planes. It is filled with aircraft from the 1920s (heavily modified by Miyazaki) and their technical details, as well as with the men (good-hearted and silly) who love them.