What is {end time} and {start time} of {{Boeing 747} has {operator} as {Air Algérie}}
What was the begin and wrap up time of the Boeing 747 which was worked by Discuss Algerie?
What was the start and finish time of the Boeing 747 which was operated by Air Algerie?
SELECT ?a ?n WHERE { ?z property:end_time ?a . resource:Boeing_747 property:operator ?z . ?z property:start_time ?n . ?z property:operator resource:Air_Algérie }
select distinct ?value1 ?value2 where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q179> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P137> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q406764>. ?statement <http://www.wikidata.org/entity/P580> ?value1 . ?statement <http://www.wikidata.org/entity/P2842> ?value2 } 
SELECT ?value1 ?value2 WHERE { wd:Q179 p:P137 ?s . ?s ps:P137 wd:Q406764 . ?s pq:P582 ?value1 . ?s pq:P580 ?value2 }