= wikidata =
Wikidata is a free and open knowledge base that can be read and edited by both humans and machines.

Wikidata acts as central storage for the structured data of its Wikimedia sister projects including Wikipedia, Wikivoyage, Wiktionary, Wikisource, and others. 

 * https://www.wikidata.org/wiki/Wikidata:List_of_properties/science
 * https://www.wikidata.org/wiki/Q597

== Query ICAO codes ==
 * https://query.wikidata.org/#SELECT%20%3Fitem%20%3FitemLabel%20%3Fid%20WHERE%20%7B%0A%20%20%3Fitem%20wdt%3AP239%20%3Fid%0A%20%20SERVICE%20wikibase%3Alabel%20%7B%20bd%3AserviceParam%20wikibase%3Alanguage%20%22%5BAUTO_LANGUAGE%5D%2Cen%22.%20%7D%0A%7D
{{{
SELECT ?item ?itemLabel ?id WHERE {
  ?item wdt:P239 ?id
  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
}
}}}

{{{
SELECT DISTINCT ?id WHERE {
  ?item wdt:P239 ?id
  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
} ORDER BY ?id 
}}}

== Query IATA codes ==
{{{
SELECT ?item ?itemLabel ?id WHERE {
  ?item wdt:P238 ?id
  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
}
}}}

{{{
SELECT DISTINCT ?id WHERE {
  ?item wdt:P238 ?id
  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
} ORDER BY ?id 
}}}