Airplanes are very exposed to sunlight both when they are in flight and when they are parked on the ground. White paint is the best way to minimize cabin heating and prevent potential damage from solar radiation.
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Painting an aircraft white helps to reflect the sunlight, and minimize the amount of energy needed to keep the plane comfortable. Modern airplanes that are made from composite materials need even more protection from the sun as they can be damaged by UV radiation, which is another reason why white paint is used.
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.
The answer is YES – you can wear glasses and be an airline pilot! Perfect uncorrected vision is not a requirement to be a pilot or an air traffic controller. Glasses, contact lenses and refractive surgery are all (with certain limitations) acceptable ways to correct visual acuity problems.
To fly as a commercial airline pilot, you will need 1500 hours of experience, which can be earned in two years. ATP's accelerated commercial pilot training programs provide a structured timeline and shorten the time it takes to gain experience and meet qualifications.