The planes on the sides of the hills, are those mostly American planes, by chance? The Japanese air traffic would come from further up The Slot, and should not be running into too many mountains, but might be. Do you know if your submarine was spotted by Japanese forces, either sea or air? I'm doing more testing in the area now, but I have not encountered a lot of air traffic. For it to be heavy, it would have to be either an AirBase that keeps detecting the enemy (which would include the CV, of course), or a set group that is looping, of which I cannot see in the campaign. There are those Solomon "Lifeguard" missions, but they should not be activating...
