The Air France Flight 447 crash, considered one of the worst aviation disasters in history, could have been avoided, a top-ranking aviation safety expert said. "Absolutely, this accident didn't have to happen," said William Voss, the president and CEO of the Flight Safety Foundation. BEA, the French government's official accident investigators, conducted a three-year investigation into the crash, which killed all 228 people on board, including one married couple from Louisiana, when the Airbus A330 slammed into the Atlantic Ocean off the coast of Brazil in 2009. In the agency's final report, which was released today, investigators determined that a...