>>4275095 LB
This might be notable!
Plane Circled town of Hamlin Texas
What I found on a quick dig and Key words. that popped in these articles.
http://www.city-data.com/city/Hamlin-Texas.html
https://tshaonline.org/handbook/online/articles/hgh03
Looking at the data, may be part of the smuggling route from Mexico?