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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.
ICAO location identifiers are linked to each airport's Aeronautical Information Publication (AIP), which are available online in Portable Document Format (PDF) from the French Service d'information aéronautique. Locations shown in bold are as per the airport's AIP page.
"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
ICAO code Type FIR or ACC name Oceanic or other subtype Country or territory AGGG FIR Honiara ACC Solomon Islands: ANAU FIR Nauru ACC Nauru: AYPM FIR Port Moresby ACC Papua New Guinea: BGGL FIR Nuuk ACC Greenland ( Denmark) BIRD FIR Reykjavík ACC Iceland: CZEG FIR Edmonton ACC Canada: CZQM FIR Moncton Southern ACC Canada: CZQX FIR
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