Planes are almost always painted white. Like anything in aeronautical engineering, this does not happen by accident. Quite why has long been a topic of speculation. Reasons for giving planes a lighter shade of paint range from weight to visibility.
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White Makes it Easier to Spot DamageWhite color makes it very easy to detect bumps, cracks, bird strikes and even oil spills on the aircraft. These damages are always darker than white, which makes it very easy to identify them. Thus, white facilitates safety routines and therefore protects pilots and passengers.
It's a constant balance between safety and efficiency. For example, by removing the mica layer previously used when painting its Boeing 737-800s, American Airlines saves nearly 300,000 gallons of fuel annually. Repainting airplanes is also an opportunity for airlines to distinguish themselves from competitors.
Because it is the most common color, white paint is also the cheapest on the market. It is therefore the preferred color for many airlines for their planes. But that's not all, white is also the thinner paint and therefore the least heavy.
Aircraft can be painted any colour. In terms of civil aviation white was often preferable, and not just because of the weight difference as mentioned by others. When an aircraft crashes it is easier to spot white wreckage against the background terrain or, indeed, ocean.
The spraying of airplanes as they land is a tradition known as the “water salute.” As explained by Wikipedia, it's performed for ceremonial purposes, such as the retirement of an airplane. When an airplane makes its final flight, it's honored with the water salute once it lands on the tarmac.
Yellow inside an airplane can make our eyes tired.While yellow is a color that evokes happiness, it is such a bright color that it reflects more light and hence could stimulate the eyes too much. This might explain why most vehicles, especially airplanes, hardly ever use yellow in their interior.
Airline pilots take turns using the bathroom nearest the cockpit during a flight. There are no bathrooms installed in the cockpit. For airplanes with a single pilot, diapers, catheters, or collection devices are used if they are unable to land to use the airport bathroom.
Pilots use the same bathroom as the passengers, much to the delight of the younger (and sometimes older) people on board! They also eat and drink during flights - usually being served beverages and their meals in the cockpit by the cabin crew.
Green zinc chromate or zinc phosphate primer is applied to prevent corrosion on the aluminum surface. Since the anti-corrosion chemical and primer are used on all newly produced aircraft, all new aircraft look green.