PNG Screenshot captured via Steam (you need to enable these lossless-compression images in the settings):
Now just select the Auto-Level option in Paint.NET and…
I made a little tweak to brightness/contrast to remove some graininess but still - wow. Had no idea that much detail was in these screenshots. On my desktop monitor I could see the outline of the island, the aircraft, the landing lights and some stars, but when I got a laptop and looked at the image it was much darker and I could barely make out anything. This is what made me try to enhance it.
If anyone else has night screen captures lying around - would like to see your results (using whatever image editor you prefer)