Mostly, the seats of airplanes are blue.
Most airlines across the board use various shades of blue in their cabin seats, and it’s no coincidence. There does appear to be some psychology behind it.
“It’s all about making the travelling experience less stressful and blue is said to evoke a feeling of calm. Blue is associated with the positive qualities of “trust, efficiency, serenity, coolness, reflection and calm,”
While some of the more budget airlines might use brasher, bolder shades, most others go with muted tones. The overarching aim is to create a home-like relaxing feel, so airlines tend to use muted colours that feel domestic, natural and earthy for that reason."