Corncob 3D

At first, I thought I might have found me a mate, but alas, its just a computer game:

"Corncob 3D/Deluxe is an early flight sim where WW2 never happened because Hitler had a fatal injury in his youth. However, in it's place, aliens have decided to invade Earth (again) because they need someone to clean their toilets (not really a joke). However, despite the fact that they can travel light years in a short span of time, they can only seem to muster projectile weapons in their invasion, and a simple 500 lbs. bomb can blow up most of their structures. Therefore, they have been unable to completely take over as of yet. Also, out of all of the planes that were developed during World War II, the only one to make it into this alternate universe is F4U Corsair. And this sets the stage for you. You come on to the scene as a pilot fighting against the aliens, based at locations dangerously near the front lines. In Corncob Deluxe, these locations include a grassland, a wasteland, an area in which missions can only be flown at night, and the aircraft testing area at White Sands, New Mexico.