NEW : A British aviation consultant said he is skeptical about how useful the memory unit will be to investigators , considering it has been sitting between 2,000 to 4,000 meters ( 6,562 to 13,124 feet ) below the ocean 's surface for 23 months . Air France calls the recovery `` very significant '' British aviation expert skeptical data remains ; British expert hopeful . All 228 people aboard the Air France Flight 447 from Paris to Paris were killed . The Air France A330 plunged into the Atlantic Ocean on last week .
NEW : Air France calls the recovery `` very significant '' British aviation expert skeptical data remains ; British expert hopeful . All 228 people aboard the Air France Flight 447 from Paris to Paris were killed . The Air France A330 plunged into the Atlantic Ocean on last week .