"Jeff Saylor" wrote in message
...

That's usually true. An exception is G. O. Carlson-Chester County
Airport,
Pennsylvania. It's had weather reporting for a while now and I've heard
of no
plans to change its identifer from 40N.

The primary motivating factor to change to a 3-letter identifier is when an
airport has a localizer or ILS approach. The FAA has decided they want the
navaid ID to match the airport ID, i.e. in Pennsylvania 2G3 was changed to
KVVS because the localizer is IVVS and the NDB/FAF is VV.

--------------------
Richard Kaplan, CFII

www.flyimc.com