Ever noticed the small black or red triangle stickers above airplane windows? Most passengers miss them, but they serve an important purpose. These markers align with the wings’ front and back, helping flight attendants and pilots locate and inspect critical wing components like flaps and slats.

Interestingly, these triangles can benefit passengers too. Since they mark the plane’s center of gravity near the wings, seats in this area experience less turbulence—ideal for those prone to motion sickness.

Next time you fly, keep an eye out for these subtle yet functional details!