I looked again...
I see what you mean about the air to air scenes...especially at the beginning.
The P47's and the air to ground (which, I assume are from the P47's -- but you can't really be certain) scenes seem ok.
I had a look in the comments. Someone says that this is an excerpt from this:
('scuse me while I get the link)...ok, got it:
Sorry, that's an advert.