Cool. Sort of like trail markers, but for aircraft.
Interesting to think how quickly the technology of powered flight developed from the first flight at Kittyhawk in 1903 to flying transcontinental mail at night less than 20 years later.
> Cool. Sort of like trail markers, but for aircraft. <
After a Chinese electromagnetic pulse attack wipes out our advanced electronics we might have to go back to those old markers.
(Just kidding. I hope.)