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Decades-Old Mystery Put To Rest: Why Are There X's In The Desert?
Pez Owen was flying over the desert in her single-engine Cessna airplane when she spotted a huge "X" etched in the desert below. She says it was the strangest thing. "It's not on the [flight] chart," Owen says. "There just wasn't any indication of this huge cross." Then she spotted another one. (www.npr.org) Más...they should go find the airmail route markers and do a story on them, too...
FWIW: here's a few links to these very similar markers...
http://sometimes-interesting.com/2013/12/04/concrete-arrows-and-the-u-s-airmail-beacon-system/
https://en.wikipedia.org/wiki/Transcontinental_Airway_System
https://en.wikipedia.org/wiki/Airway_beacon
http://www.dreamsmithphotos.com/arrow/arrows.html
http://sometimes-interesting.com/2013/12/04/concrete-arrows-and-the-u-s-airmail-beacon-system/
https://en.wikipedia.org/wiki/Transcontinental_Airway_System
https://en.wikipedia.org/wiki/Airway_beacon
http://www.dreamsmithphotos.com/arrow/arrows.html
The old days when boxcar cargo planes would snag the film payloads dropped by the satellites. https://youtu.be/0osF4MFfdQA?t=27m
You will see x's or v's painted or made of sheet rock or fabric on streets, in fields, parking lots and such. These are often aerial survey control points. These control points are used to orientate imagery used in high accuracy mapping for engineering.