I'm not 100% sure, but I don't think so..
For the Japanese mission there are three routes defined, and each route has 7 flights with one plane per flight. For the Americans there is two routes with two flights each containing one plane per flight. When the Americans attack the first group of Japanese planes attached to the first route everything behaves as expected. However I have a second route containing a group of planes for the Japanese that shows up 10 seconds after the dogfighting begins between the first groups. It varies each time you run the mission in the editor but the second group at times comes within 800 meters(using the icons measure) of the American planes but they don't react. They continue to fly on as though they are in a cruise segment instead of a attack.
