What are the triangle stickers on a plane?

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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“The black triangle marks the location of what has been called William Shatner's Seat, the seat with the clearest view of the wing,” explained retired aerospace engineer Lee Ballentine after the question was posed on Q&A website Quora.

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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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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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In most transport category aircraft, there are two anti-collision lights. One is called the beacon and the other is called the strobe. A beacon is a red flashing light. In many aircraft, there are two beacon lights - one on top of the fuselage and the other on the belly of the aircraft.

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People On Board is a more appropriate term as it includes passengers, crew members, and other airline employees. The word Souls has its origins in nautical phraseology and was used to count the number of passengers and crew on ships lost at sea, reflecting the dangerous nature of seafaring.

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That's the pitot tube. It is an air pressure sensor used to measure airspeed.

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