The color white is a terrific reflector of sunlight, and reflects almost all the light that falls on it, unlike other colors, which absorb some of the light.
If you paint your airplane in a color other than white, it will absorb sunlight and heat up the body of the airplane, which is something you want to avoid. White, on the other hand, reflects that sunlight and avoids the gradual build-up of heat on the plane. This is a good thing, not only when the airplane is in flight, but also when it’s parked on the runway, because it takes less time to cool down down after sitting on the ground in a hot, sunny environment. In fact, some planes actually ‘need’ to have a coating of white paint in order to guarantee a structurally sound flying machine.
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