More realistic gun sights?
Scratches/warping on cockpit windows? Glare?
Bigger 'shine' around the sun so it can be of more tactical use?
Cockpit shake? When engines start, flying and/or when triggers are pressed?
Water droplets on windshield due to clouds/low channel flying?
I'm sure others can add to the list but these are just small things I think about in regards to immersion.
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