[stansdds]

at high altitudes the sky is darker, and arround 30000 meters it's black

Let's not confuse meters with feet, we'll leave that error to NASA :roll:. 30,000 meters equals 98,425 feet, Il2 doesn't allow flights to that altitude. I'm sure the sky is dark at 30,000 meters, but we are talking about the sky at 9,000 to 10,000 meters (roughly 30,000 feet).