About: http://webisa.webdatacommons.org/210113778

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	I think a terrorist hijacking or pilot suicide are probably the most plausible explanations based on what is out there so far (and, yes, it is pure speculation on my part).
http://www.w3.org/ns/prov#wasQuotedFrom	airliners.net