Interesting, I maybe wrong but wasn't Turkey supposed to have the attitude very similar to Spain ?? We all know General Franco made a bunch of deals with the Germans throughout the 30s and WW2, and that Hitler himself even asked him to declare war on the allies during WW2 but Franco had turned him down, however he did helped them out with under the table deals.
So I take it that Turkey had probably the same attitude, especially since the Ottoman Empire was on the Germans side during WW1, still, had Turkey entered the war on the German's side during WW2, it would've meant the Germans would have a complete free access to attack the Middle-East directly, as we can guess, one of the targets Hitler himself would've picked on his political agenda at some point would obviously have been Palestine, which is today Israel.
I really don't think Churchill nor Stalin would've liked that kind of move on Hitler's plans, heck, the British were taking a good chunk of their oil from the Middle-East, and so did the Soviets. But in the Soviet's case, it was Baku and the Caspian Sea, which were very close to Turkey, like Odessa and Sevastopol on the Black Sea, as for the British it was what is today the Arab world, especially Iraq, Iran and Saudi Arabia along with probably Kuwait. Would've completely disrupted their entire oil supplies, which would've given the Germans a serious edge over WW2.
I hope you complete your campaign, it looks really promising for an idea, and very interesting to play, I know I'd download it for sure, so which planes would you have in mind to pilot for the Turkish Air Force ??
I like this idea on this campaign, keep it up, I want to fly it some day.