query: #defaultView:Map{"layer":"?gender"}
  SELECT ?airport ?airportLabel ?location ?person ?personLabel ?gender WHERE {
    ?airport wdt:P31/wdt:P279* wd:Q1248784;
              wdt:P625 ?location;
              wdt:P138 ?person.
    ?person wdt:P31 wd:Q5.
    OPTIONAL {
      ?person wdt:P21/wdt:P279* wd:Q6581072.
      BIND("female"@en AS ?female)
    }
    OPTIONAL {
      ?person wdt:P21/wdt:P279* wd:Q6581097.
      BIND("male"@en AS ?male)
    }
    OPTIONAL {
      ?person wdt:P21 ?gender.
      MINUS { ?gender wdt:P279* wd:Q6581097. }
      MINUS { ?gender wdt:P279* wd:Q6581072. }
      FILTER(!ISBLANK(?gender))
      BIND("other"@en AS ?other)
    }
    BIND(COALESCE(?female, ?male, ?other, "unknown"@en) AS ?gender)
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
  }