system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: Why are commercial planes never black?

I've seen jet planes of several colors. Almost always white but never black. Is it a heat absorption thing?
gpt
Heat plays a factor but the largest factor surprisingly, is weight. Dark-colored paints weigh more due to larger amounts of pigments. When you spread that over multiple layers for the size of a large aircraft, it's significant enough that there isn't really a benefit to doing it. Additionally it can be harder to spot damage on dark surfaces, which is bad.  

It's used by the military in some instances because it's easier to hide a plane at night if it's dark-colored.