query: #title: Operate an airport
  # Complex constraint from [[Property talk:P137]]
  # Detect some mistakes
  SELECT ?item {
  	?item wdt:P137 ?value;
            wdt:P31 wd:Q1248784.
      MINUS { ?value wdt:P17 [] }
      MINUS { ?value wdt:P31/wdt:P279* wd:Q43229 }
  }