What are the best flight sims on PC?

I installed Jane's WWII Fighters on my laptop today. It is from 1998 and only has the P-51d Mustang, P-38J Lighting, P-47d Thunderbird, Spitfire, Bf-109G-6, Folkwulf 190A, and Messerschmidt Me-262. It's more arcade style flight than actual sim but it is still a ton of fun.

I also had Microsoft Combat Flight Simulator 2 from 2000, which was the Pacific theater. I had a very difficult time trying to shoot any one else down when I played this when I was younger.

I also still Microsoft Flight Simulator 2004 a century of flight!. I enjoyed that game as well.

What are some good flight sims? Especially combat ones or World War 2 ones