Airplane is a collectible relic found in Shadow of the Tomb Raider. It is part of the Myth, Magic & Monsters collection, located in The Hidden City.
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How can these shapes be Incan, when they look like airplanes? Oh, I see - they're insects of some sort. Archaeology is a very delicate field of study; you have to put yourself in the mindset of people and cultures who died centuries before you were even born. Humans interpret strange phenomena based on what they already know. If the Inca had seen planes, they might have assumed they were some sort of bird. Given that, these shapes may not be insects after all; some of them look more like fish.
Map[]
In treasure chest