![]() ![]() In marginal weather,as temptations, they were probably about as hazardous as they were helpful. The lights established a rudimentary airway system but were useless for instrument flying. A few of these still exist, together with the 60-foot-long concrete arrows, embedded in the ground, that pointed to the next beacon. After the postal service began shipping mail long distance by air in the 1920s, its pilots needed a better way of navigating at night, and the Department of Commerce responded by installing 1,500 beacon lights to guide pilots along commonly traveled routes. At the dawn of aerial navigation, pilots found their way with landmarks and dead reckoning.
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