Red Baron ia an absolute classic. The dynamic campaign style is awesome, allowing to fly for the Allies or Germany. You progress in your career, eventually might be able to get your own squadron and fighter of choice.
I recommend to use the xbaron patch for this game, made by a guy called Rob Church, back in the 1990’s. The patch introduces a frame limiter and several joystick improvements.
This is one of the great flight sims for DOS, hours and hours of fun!
