Thanks to the C# thread here lately I just had to start a small hobby project in Unity3D / C#
Look at the attached image (ingame of course

). I have two thoughts. One is to connect this small slow paced strategy game to the C# server side code of a CloD server so all the plane groups move as they do in the game, and when the "Fighter Commander" using this game issues an order it gets into the CloD server as a text message to the pilots you try to control... And you naturally should be able to spawn new AI flights etc...
Another thought is a standalone BoB strategy game like the ones from the 80:es and 90:ies where you control squadrons that you launch, with pilot experience, fatigue etc to take care of for RAF. Which squadrons to put on patrol, which on 5 minute standby? Maybe recon flights and sea rescue? How many reserves for each squadron, who gets the new Spits? For the Luftwaffe you naturally have to hit radars, airfields, convoys and factories that will influence the RAF player... Maybe London if you are stupid? And if the german player gets X victory conditions like number of serviceable RAF fighters below 200 and functional radar installation below 25% he can launch Seelöve - and then you have to protect the barges with your fighter cover
And then there should naturally be mod support so you can create new maps and scenarios like Malta, Guadalcanal etc
For this test project I have used the awesome map IvanK did some time ago from the CloD terrain and some free spit 3D models from the net... And yes - you don't have to worry that invasion striped Mk IX Spits will make it into the final game