Although I love playing cod4, my favorite PC game is Flightsim X, With all the addons I have I can really get engrossed into a simulated flight in almost any aircraft and go anywhere in the world. Microsoft stopped updating the Flightsim game over 10 years ago, and although others have made addons for the game. Most are quite buggie. There are other Flightsims available but not really to the same standard.
Then in June this year Microsoft announced that a new one will be out in 2020. I've monitored this for a few months as I didn't really believe it. But all the news since just gets better.
The only downside I fear is, it will turn into a monthly or annual subscription game. Or the planes will be limited to just a few. But the scenery looks amazing and most importantly realistic and actual. So Visual Flight Rules (VFR) is achievable. Which is really fun in a light aircraft.