These are the reasons why airplanes painted white.
1. Heat reflection
White paint reflects significant amount portion of sunlight keeping the airplane cool.
2. Reduced cabin cool costs
Reflecting sunlight translates to less need of air-conditioning to cool the cabin during flight at daytime.
3. Damage detection
White surface makes it easier to detect any damages.
4. Radiation protection
High altitude flying exposes airplanes to more intense solar radiation.
4. Psychological effect
White colour is always associated with cleanliness and sterility.
5. Historical reasons
From early days, white colour is chosen to provide a clean and finished look.
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