Dogfight is a multiplayer mod for half life 2. In dogfight you can choose between the most famous airplanes of world war one and play as an ace against other players. All airplanes have different properties and act differently. Airplanes have 3 properties: Agility, durability and speed. Choose the airplane which suits you best and your preferred paint on it. While the mod doesn't aim to be completely realistic the airplanes are being recreated with accuracy and quality.
Progress shots of df_kampf map
Nice pic
You might want to do something about those tiling ground textures. It would improve the look of this immensely.