10 Wonderful mysteries about airplanes that you probably did not know about

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Black triangle

According to the pilot of an Airbus A320, these triangles are the best places to see the fins of the aircraft. If the counter and electronic signs in the cockpit do not work properly, the pilot and the crew should be sure that the fins and valves are in the correct position, and in this situation, these triangles will be a good guide.

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