{"id":27289,"date":"2018-08-02T09:30:34","date_gmt":"2018-08-02T07:30:34","guid":{"rendered":"https:\/\/www.ferrovial.com\/blog\/?p=27289"},"modified":"2025-12-11T18:22:27","modified_gmt":"2025-12-11T17:22:27","slug":"airport-codes","status":"publish","type":"post","link":"https:\/\/www.ferrovial.com\/blog\/en\/2018\/08\/airport-codes\/","title":{"rendered":"From AAA to ZZV: the strange world of airport codes"},"content":{"rendered":"\r\n<p><script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"FAQPage\",\r\n  \"mainEntity\": {\r\n    \"@type\": \"Question\",\r\n    \"name\": \"How does IATA assign its codes?\",\r\n    \"acceptedAnswer\": {\r\n      \"@type\": \"Answer\",\r\n      \"text\": \"Although there isn\u2019t a common pattern to fit all codes, some of the guidelines used by IATA seem obvious:\r\n<ul>\r\n<li>The general rule is to use the first letters of the name of the <strong>city in which the airport is located<\/strong>: BOS = Boston<\/li>\r\n<li>If a city has several airports, the <strong>name of the airport is used<\/strong>: JFK = John F. Kennedy International Airport (New York), LGA = LaGuardia Airport (New York).<\/li>\r\n<li>Some cities use the old <strong>two-letter meteorological codes<\/strong>: LAX (Los Angeles) uses the old code LA (its initials) with an X to make it three letters. In the same way, PDX = Portland and PHX = Phoenix.<\/li>\r\n<li>Sometimes, <strong>alternative names<\/strong> are used: EAS (San Sebasti\u00e1n) comes from Easo (traditionally, it was thought that the old Roman city of Easo\/Oiasso was located there). XRY = Jerez de la Frontera, from Sherry\/Xherry (Jerez).<\/li>\r\n<li>In the case of cities having the same name and each having airports, the codes<strong> must be different<\/strong> to avoid confusion: SJC = San Jose, California (United States) and SJO = San Jos\u00e9 (Costa Rica).<\/li>\r\n<li>When there is a shared airport for various municipalities or regions, <strong>the names are sometimes combined<\/strong>: DFW = Dallas-Fort Worth.<\/li>\r\n<li>In some cases, the airport\u2019s <strong>previous designation<\/strong> is used even if its name has since changed: ORD = O\u2019Hare because its old name was Orchard Field.<\/li>\r\n<li>Some <strong>letters are reserved<\/strong> for US airports, a rule which is only applied there: <strong>N<\/strong> for the Navy and <strong>W<\/strong> and <strong>K<\/strong> for the Federal Communications Commission for radio broadcast stations. Thus, ORF = Norfolk (Virginia) rather than NOR, which identifies Nordfjordur (Iceland). In the same way, IAD = Washington-Dulles and DCA = Ronald Reagan Washington (District of Columbia Airport), because it can\u2019t begin with a W.<\/li>\r\n<li>Internationally, <strong>codes beginning with a Q are reserved<\/strong> (it\u2019s used as a letter for communications), in such a way that UIO = Quito (Ecuador) because it cannot be \u2018QUI\u2019.<\/li>\r\n<li><strong>In Canada all airports begin with the letter Y<\/strong>: YOW = Ottawa, YQB = Qu\u00e9bec. There are more than 30, from YAZ (Tofino) to YZF (Yellowknife), although there are also secondary airports and aerodromes that start with W, X and Z.<\/li>\r\n<\/ul>\"\r\n    }\r\n  }\r\n}\r\n<\/script><\/p>\r\n\r\n<p>Everybody is familiar with the ubiquitous <strong>\u2018three letter codes\u2019 used to designate airports<\/strong>. It\u2019s impossible not to see them on luggage tags, tickets or booking websites. Ferrovial Airports also uses codes such as LHR (London-Heathrow), SOU (Southampton), GLA (Glasgow) or ABZ (Aberdeen) on its airport assets. Although in our case the codes seem a clear abbreviation of the airport\u2019s name, in many other cases this rule doesn\u2019t hold true and the codes can become a bit of a puzzle. The case of M\u00e1laga, for example, which has the code AGP, of which more later.<\/p>\r\n<h2><strong>How does IATA assign its codes?<\/strong><\/h2>\r\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-27281\" title=\"IATA codes airports designation\" src=\"https:\/\/static.ferrovial.com\/wp-content\/uploads\/sites\/3\/2018\/08\/13145930\/Codigos-300x217.jpg\" alt=\"IATA codes airports designation\" width=\"655\" height=\"473\" srcset=\"https:\/\/static.ferrovial.com\/wp-content\/uploads\/sites\/3\/2018\/08\/13145930\/Codigos-300x217.jpg 300w, https:\/\/static.ferrovial.com\/wp-content\/uploads\/sites\/3\/2018\/08\/13145930\/Codigos-768x554.jpg 768w, https:\/\/static.ferrovial.com\/wp-content\/uploads\/sites\/3\/2018\/08\/13145930\/Codigos-800x577.jpg 800w, https:\/\/static.ferrovial.com\/wp-content\/uploads\/sites\/3\/2018\/08\/13145930\/Codigos-135x96.jpg 135w, https:\/\/static.ferrovial.com\/wp-content\/uploads\/sites\/3\/2018\/08\/13145930\/Codigos.jpg 920w\" sizes=\"auto, (max-width: 655px) 100vw, 655px\" \/> Codes are assigned by IATA (<a href=\"http:\/\/www.iata.org\/\" target=\"_blank\" rel=\"noopener\">International Air Transport Association<\/a>) since 1930 to identify the world\u2019s airports in short form. Initially, the two-letter codes of weather stations were used, or any other local convention. The 26 letters of the Roman alphabet provide 17,576 different permutations. Today, there are more than <strong>10,000 commercial airports in the world using IATA codes<\/strong>. And although there isn\u2019t a common pattern to fit all codes, some of the guidelines used by IATA seem obvious: \u00a0<\/p>\r\n<ul>\r\n<li>The general rule is to use the first letters of the name of the <strong>city in which the airport is located<\/strong>: BOS = Boston, MAD = Madrid.<\/li>\r\n<\/ul>\r\n<p>&nbsp;<\/p>\r\n<ul>\r\n<li>If a city has several airports, the <strong>name of the airport is used<\/strong>: JFK = John F. Kennedy International Airport (New York), LGA = LaGuardia Airport (New York).<\/li>\r\n<\/ul>\r\n<p>&nbsp;<\/p>\r\n<ul>\r\n<li>Some cities use the old <strong>two-letter meteorological codes<\/strong>: LAX (Los Angeles) uses the old code LA (its initials) with an X to make it three letters. In the same way, PDX = Portland and PHX = Phoenix.<\/li>\r\n<\/ul>\r\n<p>&nbsp;<\/p>\r\n<ul>\r\n<li>Sometimes, <strong>alternative names<\/strong> are used: EAS (San Sebasti\u00e1n) comes from <em>Easo <\/em>(traditionally, it was thought that the old Roman city of <em>Easo\/Oiasso <\/em>was located there). XRY = Jerez de la Frontera, from <em>Sherry\/Xherry <\/em>(Jerez).<\/li>\r\n<\/ul>\r\n<p>&nbsp;<\/p>\r\n<ul>\r\n<li>In the case of cities having the same name and each having airports, the codes <strong>must be different<\/strong> to avoid confusion: SJC = San Jose, California (United States) and SJO = San Jos\u00e9 (Costa Rica).<\/li>\r\n<\/ul>\r\n<p>&nbsp;<\/p>\r\n<ul>\r\n<li>When there is a shared airport for various municipalities or regions, <strong>the names are sometimes combined<\/strong>: DFW = Dallas-Fort Worth.<\/li>\r\n<\/ul>\r\n<p>&nbsp;<\/p>\r\n<ul>\r\n<li>In some cases, the airport\u2019s <strong>previous designation<\/strong> is used even if its name has since changed: ORD = O\u2019Hare because its old name was <em>Orchard Field<\/em>.<\/li>\r\n<\/ul>\r\n<p>&nbsp;<\/p>\r\n<ul>\r\n<li>Some <strong>letters are reserved<\/strong> for US airports, a rule which is only applied there: <strong>N <\/strong>for the Navy and <strong>W <\/strong>and <strong>K <\/strong>for the Federal Communications Commission for radio broadcast stations. Thus, ORF = Norfolk (Virginia) rather than NOR, which identifies Nordfjordur (Iceland). In the same way, IAD = Washington-Dulles and DCA = Ronald Reagan Washington (<em>District of Columbia Airport<\/em>), because it can\u2019t begin with a W.<\/li>\r\n<\/ul>\r\n<p>&nbsp;<\/p>\r\n<ul>\r\n<li>Internationally, codes beginning with a <strong>Q <\/strong>are reserved (it\u2019s used as a letter for <em>communications<\/em>), in such a way that UIO = Quito (Ecuador) because it cannot be \u2018QUI\u2019.<\/li>\r\n<\/ul>\r\n<p>&nbsp;<\/p>\r\n<ul>\r\n<li>In <strong>Canada <\/strong>all airports begin with the letter <strong>Y<\/strong>: YOW = Ottawa, YQB = Qu\u00e9bec. There are more than 30, from YAZ (Tofino) to YZF (Yellowknife), although there are also secondary airports and aerodromes that start with W, X and Z.<\/li>\r\n<\/ul>\r\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-27279\" title=\"airports names code\" src=\"https:\/\/static.ferrovial.com\/wp-content\/uploads\/sites\/3\/2018\/08\/13145931\/Airport_Codes_ES-e1533112015748-300x199.jpg\" alt=\"airports names codes\" width=\"655\" height=\"435\" srcset=\"https:\/\/static.ferrovial.com\/wp-content\/uploads\/sites\/3\/2018\/08\/13145931\/Airport_Codes_ES-e1533112015748-300x199.jpg 300w, https:\/\/static.ferrovial.com\/wp-content\/uploads\/sites\/3\/2018\/08\/13145931\/Airport_Codes_ES-e1533112015748-768x510.jpg 768w, https:\/\/static.ferrovial.com\/wp-content\/uploads\/sites\/3\/2018\/08\/13145931\/Airport_Codes_ES-e1533112015748-800x532.jpg 800w, https:\/\/static.ferrovial.com\/wp-content\/uploads\/sites\/3\/2018\/08\/13145931\/Airport_Codes_ES-e1533112015748.jpg 900w\" sizes=\"auto, (max-width: 655px) 100vw, 655px\" \/><\/p>\r\n<h2><strong>AGP (M\u00e1laga), a code with a history<\/strong><\/h2>\r\n<p>Some believe that <strong>AGP<\/strong> refers to the \u2018Roman temple of Agrippina\u2019 (which was in Rome actually, rather in M\u00e1laga), or to the abbreviation (in Spanish) of \u2018Great Picasso Airport\u2019, M\u00e1laga being the artist\u2019s birthplace. However, the explanation is much simpler: when IATA started assigning codes, MAL was already taken by the airport on the island of Mangole in the Moluccas (Indonesia) and so were MAA (Madras, India) and MAG (Madang, Papua New Guinea). And so it was necessary to resort to using just two letters, adding another one which was still free to complete all three, so AG was chosen, adding the \u2018P\u2019 at the end because the Q, which other airports like Sevilla (SVQ) or Santiago de Compostela (SCQ) use, would make AGQ which was already assigned to Agrinio (Greece). So, if you want to know more about the airports behind these codes, check out the complete list on the \u00a0<a href=\"http:\/\/www.iata.org\/publications\/Pages\/code-search.aspx\" target=\"_blank\" rel=\"noopener\">IATA website<\/a>. To learn a bit about their history, go to <a href=\"https:\/\/airportcod.es\/\" target=\"_blank\" rel=\"noopener\">Airport Cod.es<\/a>, although in some cases the explanation may sound more the stuff of legends than a true story.<\/p><p><em>An article by \u00c1lvaro Ib\u00e1\u00f1ez<\/em><\/p>","protected":false},"excerpt":{"rendered":"<p>Everybody is familiar with the ubiquitous \u2018three letter codes\u2019 used to designate airports. It\u2019s impossible not to see them on luggage tags, tickets or booking websites. Ferrovial Airports also uses codes such as LHR (London-Heathrow), SOU (Southampton), GLA (Glasgow) or ABZ (Aberdeen) on its airport assets. Although in our case the codes seem a clear [&hellip;]<\/p>\n","protected":false},"featured_media":27283,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"_acf_changed":false,"footnotes":""},"nivel-1":[4660],"nivel-2":[7226,4803,4741,4677,5771],"nivel-3":[],"nivel-4":[5704,5734],"nivel-5":[5672,5676,5670,5668],"topic":[7296,7299,7295],"coauthors":[3794,4998],"class_list":["post-27289","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","post_format-post-format-image","nivel-1-airports","nivel-2-aereo-en","nivel-2-air-traffic","nivel-2-airport-infrastructure","nivel-2-aviation","nivel-2-management","nivel-4-andalucia-en","nivel-4-madrid-en","nivel-5-aberdeen-airport","nivel-5-denver-international-airport","nivel-5-glasgow-airport","nivel-5-heathrow-airport","topic-construction-and-infrastructure","topic-management-and-strategy","topic-transportation"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Airport codes, know their curiosities - Ferrovial&#039;s blog<\/title>\n<meta name=\"description\" content=\"Everyone knows the famous &quot;three-letter codes&quot; that designate airports. 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