That works too, but if you have a monitor that has FreeSync or GSync capabilities, you are leaving a smooth experience on the table.
If Flight Simulator could generate 60 frames per second (FPS) consistently, and your monitor is set to refresh at 60 Hz (cycles per second), you would be OK. VSync makes sure that you get each frame sent to the monitor at a the right time, and you won’t get screen tearing, which happens when a new frame is sent to the monitor the current one hasn’t finished displaying.
But Flight Simulator is usually incapable of drawing 60 frames per second, so with VSync enabled at 60 FPS, you will get stuttering, which happens when frames are further apart than the refresh rate of the monitor, at a rate that does not divide it exactly. You may be better off in case setting Flight Simulator to 30 or even 20 FPS (both divide 60 exactly). You’ll see what I mean if you try it. No stutters, but it will look like stop-animation.
With FreeSync or GSync enabled, the monitor will synchronize with the game. If Flight Simulator is drawing 45 frames per second, the monitor will refresh at 45 Hz (some caveats apply). All frames will be displayed as they arrive, and the experience will be much more fluid.