Blå himmel

Title translates as "Blue sky"

From the creator's page:

Blå Himmel is set on another world, where races and nations haven't fought against the big Evil, but against each other; a world-encompassing war has split elves, humans, dwarves and orcs, the different races have been forced to fight their own kind in the name of nationalism.

But now the war has ended and a fragile armistice reigns. There are, however, powers that see profit in the industries of war, and who do what they can to make the war go on. There are nationalists on both sides who can't imagine peace with their enemies. All this threatens the budding peace, and therefore a band of volunteers have left the warring nations and begun to guard the armistice and the fronts.

With fragile bi-planes, lethal orcish chase- and panzer zeppelins, superfast but clumsy dwarvish rocket planes and elven flying beasts, the Fehnmayer Movement are patrolling the fronts in order to subdue all attempts to get the war started again, and to cool down the once so heated relations. Their objective is to be a watchful eye, a wind of peace and a voice of thought in a world that has been scarred by war in over six hundred years.

Nationalism once unified the races beneath the same flags. Now, it is the hope for peace that unifies the nations again, beneath the same blue sky.