"Jamie Rogers" wrote in message
...

This airport has weather reporting via an AWOS. Yet its
identifier is still 40N. Other airports have had their
identifier changed to a 3 letter (well 4 including the K
prefix) when they got weather reporting capability. So why
has Chester County G O Carlson Airport remained as 40N?
http://www.airnav.com/airport/40N


How long has it been since the AWOS was commissioned?