I have recently encountered this teaser that has very interresting image rendering (mix between 3D and 2D comics) :
http://vimeo.com/17053492
Also, for those that haven't been close to what japanese animation has to offer, this is probably the nicest stuff I've even seen regarding to WW2 dogfights / pilot story (very fictionous also).
"The Cockpit" from Matsumoto (1993)
Wiki :
http://en.wikipedia.org/wiki/The_Cockpit_%28film%29
Video :
And off course, prior to WW2 era, there is this maginificient movie called "Porco Rosso", from Hayao Miyazaki :
Wiki :
http://en.wikipedia.org/wiki/Porco_Rosso
Video :
You can find the film in DVD with english subtitles easily on amazon, and I recommend the french version for those who speak french, because the main character is perfectly dubbed by Jean Reno.