Many wonder how French investigators, who announced their findings Thursday, could arrive at that conclusion when so little evidence has been recovered.
Two recent Airbus A330 flights may have had similar computer malfunctions to those suspected in AF Flight 447, the National Transportation Safety Board said.
There's been a pattern of irregularities linked to the tail fin, but Airbus says it's too soon to know.
Anomalies in on-board computerized controls have destabilized other A330 jets. Airbus sees no link between those cases and Flight 447.