This is a great use case for AR.
All the AR use cases I fantasize about are those where it’s desirable to overlay data on what you can actually see— such as visualizing air currents and the like, while allowing your eyes to see the real world without a camera as the ‘middleman’.
Any AR flight simulator I can think of would be less immersive than what these people are building, since they’ve pretty much nailed the experience of being in an airplane cockpit. How would putting equipment on your face add to that?