What is the triangle above the seat of a plane?

Sci-fi series aside, these black and red, triangle-shaped stickers are actually important reference points for the flight crew — as they're located where the airplane's wings are visible — allowing flight attendants to easily view the flaps and slats on the wings for potential icing problems or issues that may need to ...



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An especially astute passenger will notice that these little triangles throughout the cabin line up with the wings outside the plane. If flight crew need to check the wings, these triangles let them know the best vantage points for the slats and flaps outside.

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If the crew believe there is an issue with a wing – the flaps, the slats or even engines – looking out of the window is the best way to verify visually their concerns, one way or another. And to do that they will head to the best seat in the house, usually marked by a small black triangle on the interior cabin wall.

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If there is a problem on-board and the crew is unsure about the condition of the aircraft, the triangle indicates what window should be used to inspect flaps, slats or engines or look out for icing. This saves important time in case of an emergency, as the crew doesn't has to search the right window to look out.

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Winglets reduce wingtip vortices, the twin tornados formed by the difference between the pressure on the upper surface of an airplane's wing and that on the lower surface. High pressure on the lower surface creates a natural airflow that makes its way to the wingtip and curls upward around it.

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Its main element has always been a triangle in the form of the Greek letter “delta” with the addition of the company name. To date, the logo contains a dark red triangle and a laconic Delta inscription to the right of it.

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Why do the flight attendants touch the overhead compartment so often? Flight attendants don't just touch the ceiling for fun when they walk; the bottom of the overhead compartment has a scalloped area that provides a better grip when walking down a moving airplane.

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All aircraft toilet can be locked/unlocked from outside. The doors can also be locked in the open or closed position for bi-fold doors and locked closed for other types.

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But where do they do it? Most Boeing 777 and 787 airliners have a secret stairway that leads to a tiny set of windowless bedrooms for the cabin crew — including hidden bedrooms for pilots — that few people know exist.

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Short answer: Because planes are larger than birds. Flying by flapping their wings works very well for birds and insects. Machines that fly this way, known as ornithopters, have been built, some large enough to carry a man. But larger than that and the laws of physics become a serious problem.

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