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The four parts of WSI are identifier series, issuer, issue number, and identifier. Existing WMO identifiers were migrated to the WSI format, e.g. "0-20000-0-72295" for LAX. "20000" is the issuer code for WMO itself, and countries use their three-digit ISO code as issuer code; A presentation at the WMO site [6] explains:
"ICAO Location Indicators by State" (PDF). International Civil Aviation Organization. 17 September 2010. Archived from the original on 9 March 2013. "United Nations Code for Trade and Transport Locations". UN/LOCODE 2011-2. UNECE. 28 February 2012. - includes IATA codes; Aviation Safety Network - IATA and ICAO airport codes
"ICAO Location Indicators by State" (PDF). International Civil Aviation Organization. 17 September 2010. Archived from the original (PDF) on 9 March 2013. "United Nations Code for Trade and Transport Locations". UN/LOCODE 2011-2. UNECE. 28 February 2012. - includes IATA codes; Aviation Safety Network - IATA and ICAO airport codes
The ICAO airport code or location indicator is a four-letter code designating aerodromes around the world. These codes, as defined by the International Civil Aviation Organization and published quarterly in ICAO Document 7910: Location Indicators , are used by air traffic control and airline operations such as flight planning .
"ICAO Location Indicators by State" (PDF). International Civil Aviation Organization. 17 September 2010. Archived from the original (PDF) on 9 March 2013. "United Nations Code for Trade and Transport Locations". UN/LOCODE 2011-2. UNECE. 28 February 2012. – includes IATA codes; Aviation Safety Network – IATA and ICAO airport codes
The DST column shows the months in which Daylight Saving Time, a.k.a. Summer Time, begins and ends. A blank DST box usually indicates that the location stays on Standard Time all year, although in some cases the location stays on Summer Time all year. If a location is currently on DST, add one hour to the time in the Time column.
Archived from the original (PDF) on 9 March 2013. "United Nations Code for Trade and Transport Locations". UN/LOCODE 2011-2. UNECE. 28 February 2012. - includes IATA codes; Aviation Safety Network - IATA and ICAO airport codes; Realignment of Location Indicators Related to The New AFTN Addressing from AIP Supplement, effective date : 05 MAR 2015
"ICAO Location Indicators by State" (PDF). International Civil Aviation Organization. 17 September 2010. Archived from the original (PDF) on 9 March 2013. * "United Nations Code for Trade and Transport Locations". UN/LOCODE 2011-2. UNECE. 28 February 2012. – includes IATA codes; FAA Order JO 7350.8H - Location Identifiers. Federal Aviation ...