What is {operator} of {Boeing 747} that is {start time} is {2000-6-28} ?
Who was the Boeing 747's operator on June 28, 2000?
Who operated the Boeing 747 on June 28, 2000?
SELECT ?f WHERE { ?d property:operator ?f . ?d property:start_time ?w . resource:Boeing_747 property:operator ?d . FILTER ( CONTAINS ( YEAR ( ?w ) , '2000' ) ) }
select distinct ?obj  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> ?obj .
?statement <http://www.wikidata.org/entity/P580> <2000-6-28>
} 

SELECT ?obj WHERE { wd:Q179 p:P137 ?s . ?s ps:P137 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'2000')) }