Aviation

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Concrete Arrows and the U.S. Airmail Beacon System

Scattered across the United States are a network of mysterious concrete arrows. They are often found in remote locations or areas difficult to access....

The Only Unsolved Airline Hijacking in U.S. History: D.B. Cooper

  November 24th, 1971. An unknown man extorts $200k from Northwest Orient Airlines in Washington after taking a Boeing 727 hostage.  He releases all the...