Beautiful graphics! And I just love having a full-out simulator on my Mac. A few questions.
The "crash" sound is painfully loud and painful relative to everything else. Is there a way to turn it down or off, without turning other sounds off?
In the Sound settings dialog, what are "Extras"?
Is there a way to store a position/orientation/velocity and restart a flight from there? RealFlight has this option, and it's useful for practicing landings since you can set a position up in the air, just off the runway for restarting each flight.