Flydubai flight: How airlines prepare for emergencies?

In the wake of the crash averted by passengers aboard a Flydubai flight to Israel on Wednesday, many questions have been raised about safety on the aircraft. How was the alert raised while the aircraft was rapidly losing altitude? How were passengers able to intervene in an area that is normally locked? Our colleagues at France 2 take a closer look at the facts and the unanswered questions, as well as current safety procedures.