[propbeanie]

The airplane response is generally not in a PatrolObjective file, unless it is something specific to that particular mission assignment. The airplanes might be in any of several of the "layer" and "battle" files for specific "flights" of Random Generated Groups (RGG) or 'regular' groupings of planes or single aircraft, but again, those are generally not too heavily involved either. The main file that 'automatically' will generate airplanes (in the Stock game) is the "Allies_AirBases.mis" file. I do not have my KSDII install available on this particular computer I am on right now, so the authors of the mod may have added more files, or re-named files in the mod, but the "*_AirBases" files and the Carrier Class ships in the area are what can generate the airplanes, and that generation is based upon the settings found in the "Data / Cfg / AirStrike.cfg" file, which controls the type of response, the distance of the response, the timing and the frequency of the response, as well as the 'modifiers' for the math involved. Those are the places to check for that.

The 'luck' of the player can also be involved here, in that you may have left port at a good time, were unobserved, and then traveled along between the paths of aircraft that did generate. If you are not 'seen' by the enemy, they don't know to track you. If you do not have electronic counter-measures, there would be nothing for the enemy aircraft to 'home-in' on to follow your boat. Later in the war, you actually leave 'footprints' as you travel on the surface. Once you are 'observed' you should be constantly followed and bird-dogged by aircraft. Your boat can only travel so far in a given amount of time, and if they keep you submerged, it would be an ever-shrinking circle of the ocean...