"Jeff Saylor" wrote in message
...

Here's another interesting case, Drummond (Montana) Airport lost
its three letter identifier, DRU (or KDRU) recently. It is now M26.
It will be interesting to see where KDRU pops up next, I don't
know of many cases where an airport lost its 3 letter id.


Three-letter identifiers are assigned to navaids; to airports with a manned
air traffic control facility or navigational aid within airport boundary; to
airports that receive scheduled route air carrier or military airlift
service, and to airports designated by the U.S. Customs Service as Airports
of Entry. DRU VOR is close by, but it's not within the airport boundary, so
DRU should never have been the identifier for Drummond Airport. Apparently
somebody finally caught the error.