I saw a trailer for what I think was a short film in 2009-11 it was very manga or anime in style with an aircraft flying across a futuristic city scape with a sort dub step I guess soundtrack! It had the title sky fall or something along those lines!
Maybe space battleship yamato.
Appleseed? 🙂 https://www.youtube.com/watch?v=wY4uwf_9btw
It could be The Sky Crawlers
This isn’t a short, but could it be the 2003 animated Korean film Wonderful Days? It’s also known as Sky Blue.
[youtube=https://www.youtube.com/watch?v=0kuSBLYfwco]