Would it be logical to return night time to the Main Arenas? I know that it was a reason for dispute before because of poor visibility. Because Aces High II has a more developed system for details than Aces High I, I believe it would be able to work.
Aces High II has settings which can adjust the amount of light at day or night. Flying at night offline with default settings, visibility is significantly better than it was in Aces High I during night. Even if it were percieved to be too dark, then HTC could adjust the light level to allow more light if needed, yet keep it dark enough to maintain the perception of night.
OTOH, there are still several bugs with night time. HTC has brought the stars back, which look very nice. Yet, the moon is always visible. It even shows through mountain sides.
The cockpit lights are very bright, and light up the entire plane from external view. They are bright enough that they look like they are landing lights at a distance.
I also hate the sunrise/sunset times
