Air France Flight 447 Crash Revisited

Air France Flight 447, which crashed into the Atlantic Ocean northeast of Brazil in 2009, has been shrouded in mystery. French investigators say the final report into the causes of the crash will be released in July, three years after the passenger jet went down and killed all 228 people onboard. "Nightline" investigates one of the worst aviation disasters in modern history. (Brazilian Air Force/Getty Images)