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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:
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 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.
This template is used to display an airport's location identifiers or "airport codes". It is usually included in the first paragraph of an airport article, immediately following the airport's name. Template parameters [Edit template data] Parameter Description Type Status IATA Code 1 3-letter IATA code for this airport Example JFK, LHR, FRA String optional ICAO Code 2 4-letter ICAO code for ...
"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 AIP is updated on a 28-day cycle as per the ICAO. For the online version of the Netherlands AIPs this causes a change in the URL involving a publication date formatted as YYYY-MM-DD. The publication date is 42 days prior to the AIRAC effective date. This template uses the current date (presently 21 Dec 2024) to calculate the publication ...
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