Backgrounder: World's mysterious airplane crashes

Air France Flight 447, all 228 people on board killed

Pieces of debris of the Air France Flight 447 are seen on the Brazil's navy ship Caboclo, at the port of Recife, Brazil, in this June 19, 2009 file photo released by Brazil's Navy. The Brazilian naval ship Caboclo arrived in the coastal city Recife, carrying a significant amount of debris and passengers' baggage, the military said in an e-mailed statement. The material would immediately be made available to French investigators. [Photo/IC]