Hacker15e
Who am I? Where are my pants?
I hear the argument of shooting without using CGI, and some P-51 realism would make any aviation buff drool for days on end. However, CGI is probably cheaper to produce in the long run, and they can make the scenes without having to pay millions in insurance.
What's sad is they actually leased several Mustangs (D models, unfortunately...which is what ended up in the movie. Shoulda been B/C models) and filmed lots of footage of them taking off, landing, and in flight. They were to be the "base shots" that the CGI was placed over, and the models for the CGI aircraft.