Air France Flight 447

STORY HIGHLIGHTSAir France Flight 447 plunged into southern Atlantic Ocean killing all 228 people in 2009Investigators have not yet established what caused the airliner to crashTests on instruments measuring air speed and pressure seen as one factorExpert: Search for wreck unprecedented in terms of depth and sub-sea terrain ...

Source: http://www.cnn.com/2011/WORLD/europe/04/04/france.jet.explainer/