Dogfight 1942 (Steam key/Region free).

http://store.steampowered.com/app/217790/
Piloting a wide range of aircraft, players engage in aerial dogfights and dangerous fighter missions across the major theaters of war during WWII. Featuring realistic aircraft, DOGFIGHT 1942 introduces cutting-edge flight dynamics with unprecedented arcade accessibility. Fly over 40 historically accurate planes, ranging from the fabled P-38 Lightning and Britain´s Spitfire, to the feared Messerschmitt 109 and Japanese Kate.
Key Features
AERIAL ARCADE AUTHENTICITY
Explosive arcade action alongside advanced physics and painstaking recreation of actual events and aircraft creates an experience that’s easily accessible but hard to master
All aircraft are based on authentic models and all combat missions are representative of actual WWII engagements
Fun, dynamic battles offer a wide variety of action and most importantly targets to destroy – any given battle will combine dogfighting, escort missions and ground assault
DOMINATE THE SKY WITH FRIEND IN 3 UNIQUE CO-OP SPLIT-SCREEN MODES.
Dogfight Mode - Fly against a friend in head-to-head aerial combat, to determine who is the top Ace.
Survival Mode - Fly with your wingman battling countless waves of enemies.
Campaign Co-op Mode - Fly with your wingman through various Co-op campaign missions fighting the Axis Alliance.