Here's my critique of some things to help you out. I think you're coming along pretty well.
Most of the air combat takes place either against a blue sky or a blue sea which gives it a plain homogenous look. The good thing about that is that it makes it easier to see the planes but a little more variety through clouds and terrain would help the overall look.
Keep your shots as steady as possible. Any bouncing around of the camera or subject is distracting. Overall, you're pretty good but there's a couple of things that could be tightened up like in the first sequence with the B-24s where a lurch takes place at the end of scene. Changing the playback speed can be used in some shots to help with this. When using films, be more careful when jumping to other people's planes. The positional data of other people will not be recorded as finely as your own.
Using a Lavochkin for the interior cockpit shot is not a good choice. That's one of the oldest and most dated looking planes that we have as it's very polygonal and plain. I'd highly recommend using one of the updated planes for interior stuff.
I don't think the kill on the laggy zero shows well. It looks unnatural to me. I really like the P-51B knocking of the wing of another plane.
The end text needs more work. It's hard to read and probably needs to be tweaked to provide a more compelling message. Use
http://www.flyaceshigh.com instead of hitechcreations. Make sure the URL is prominent.
Don't forget to keep the length to 30 seconds for the final cut.
Have you got a script drafted for it already?