United Has New Uniforms - and There's a Reason Airlines Are Dressing Their Employees in Purple. Purple tends to be perceived as the most royal and trustworthy color - traits that flight attendant uniforms would want to convey.
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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.
One of Delta Air Lines' various special liveries is known as the 'Pink Plane,' as it commemorates the Atlanta-based SkyTeam founding member's partnership with the Breast Cancer Research Foundation (BCRF).
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.