Question: How many airlines have a hub at an airport run by LA World Airports?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE { ?x onto:operator <http://dbpedia.org/resource/Los_Angeles_World_Airports> . ?uri onto:hubAirport ?x  . ?uri rdf:type onto:Airline}