Here are P-51D scenes from HART'S WAR (Bruce Willis, Colin Farrell). The first link is a scene of a CGI dogfight between a Tuskegee P-51D and a BF-109. Note the B-17 trailing smoke in the background.
The second link is of real P-51Ds strafing a German train carrying American POWs.
http://www.youtube.com/watch?v=pPN4m10BysI
http://www.youtube.com/watch?v=aPA-OpwB4oE