The FAA is the source of change for these identifiers and as they forward changes to the NWS the changes will be posted on this page by their effective date. These listings are not meant to preclude the FAA's normal notification process for identifier changes via the publication of their Location Identifier Handbook 7350.6 . It is merely provided as information to aid in the transition to the METAR code. The responsible FAA organization for making these identifier changes is the National Flight Data Center (ATM-612). A subscription to the FAA's Handbook 7350.6 is available by writing to the following address or by calling 202-512-1800 (voice) or 202-512-2250 (fax):

Superintendent of Documents
Government Printing Office
Washington, DC 20402

The listings provided on the home page give you the city/state, airport name (if available), old 3-character identifier, new 3-letter identifier, and new 4-letter International Civil Aviation Organization (ICAO) identifier. Please note that for identifier changes in the conterminous 48 states, the ICAO identifier merely prefixes a "K" in front of the new 3-letter site identifier. For Alaska sites, a "PA" is prefixed which means that one of the 3 letters of the site identifier is truncated. Hawaii sites will have a prefix of "PH" added and Guam will have a prefix of "PG" added. Like the Alaska sites, the Hawaii "PH" or Guam "PG" prefixes will mean one of the 3-letters in the identifier may have been truncated.

The official list of ICAO identifiers is published by the ICAO in document 7910. This document is available from the ICAO at the following address or by calling 514-954-8219 (voice) or 514-954-6077(fax):

National Weather Service
Office of Operational Systems (OPS2)
1325 East-West Highway
Silver Spring, MD 20910
Last Modified: January 30, 2006
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