[Answer] In the 1920s, what government organization built giant concrete arrows across the U.S.?

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In the 1920s, what government organization built giant concrete arrows across the U.S.?

…1. Air Traffic Control Association 2. Department of Commerce 3. Amtrak 4. Census Bureau

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Department of Commerce - In 1920, the U.S. opened its first coast-to-coast airmail delivery route, but completing the journey wasn't easy. The airplane had only been invented 17 years earlier, and there were very few aviation charts available to guide airmail pilots along the 3,000-mile journey. To help solve the problem, the Department of Commerce and its Bureau of Standards Aeronautical Branch undertook the construction of the Transcontinental Airway System, a series of beacons and giant concrete arrows intended to help guide pilots along their cross-country journey. By 1929, the line of arrows extended from coast to coast and allowed airmail to safely travel from Atlantic to Pacific in roughly 30 hours. The system was officially decommissioned in the 1940s with the rise of radio and radar, but over 100 of the concrete markers still exist today.:

In the 1920s, what government organization built giant concrete arrows across the U.S.?

 

ANSWER : Department of Commerce – In 1920, the U.S. opened its first coast-to-coast airmail delivery route, but completing the journey wasn’t easy. The airplane had only been invented 17 years earlier, and there were very few aviation charts available to guide airmail pilots along the 3,000-mile journey. To help solve the problem, the Department of Commerce and its Bureau of Standards Aeronautical Branch undertook the construction of the Transcontinental Airway System, a series of beacons and giant concrete arrows intended to help guide pilots along their cross-country journey. By 1929, the line of arrows extended from coast to coast and allowed airmail to safely travel from Atlantic to Pacific in roughly 30 hours. The system was officially decommissioned in the 1940s with the rise of radio and radar, but over 100 of the concrete markers still exist today.:

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