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The inside of the cabin is marked with little triangles that can be either red or black. Only four windows on each plane are marked this way.

PURPOSE

👳🏻‍♂️👉If flight crew need to check the wings, these triangles let them know the best vantage points for slats and flaps outside.

👳🏻‍♂️👉It is a mark to tell the best position to view various exterior bits of the aircraft.

👳🏻‍♂️👉The markings are especially helpful in specific conditions to make sure the wings are properly de-iced (an inspection required before takeoff, although this is generally done by crew on the ground).

👳🏻‍♂️👉 If there’s any doubt about the position of the slats or flaps, the pilot can walk down the cabin, have a look through the window where the triangle is located, and see the position of the slats/flaps.

👳🏻‍♂️👉 WILLIAM SHATNER SEAT – The seats below the triangles can also sometimes be referred to as WILLIAM SHATNER SEAT. The phrase is taken from an episode of The Twilight Zone where Shatner sees a goblin out on the wing of his airplane.

👳🏻‍♂️👉Anybody who loves taking out-the-window shots or videos for any project will get the best view over the wings from these seats.