Miyazaki's family owned an airplane parts manufacturing company during WWII. In the 80s he contributed manga and illustrations of airplanes and tanks to a hobby

Miyazaki's family owned an airplane parts manufacturing company during WWII. In the 80s he contributed manga and illustrations of airplanes and tanks to a hobby magazine Model Graphix. One of these short manga, published 1989, he adapted into Porco Rosso. I don't know if the creators of Talespin would have had access to it but it is possible