For more than two years, the disappearance of Air France Flight 447 over the mid-Atlantic in the early hours of June 1, 2009, stayed one of aviation's great mysteries. How could a technologically state-of-the art airliner simply vanish?Terrorists? Bad weather? Autopilot?Equipment failure?Human error?

Quick Facts:- The plane started doing flights on the 25th February 2005- On 17 August 2006, the A330 was involved in a ground collision with Airbus A321-211 F-GTAM, at Charles de Gaulle Airport, Paris.-Had just gotten serviced.- 3 highly trained pilots, one having more than 11,000 hours of flights.

What do the experts know? The plane flew to 2512 feet above its

original altitude, and it still was ascending at a dangerously high rate, it is flying within a safe altitude. 

The stall alarm begins to sound.  Still, the pilots continue to ignore it,

(maybe they believed it was impossible for them to stall the airplane).

The computer lost its airspeed data, it disconnected the autopilot and switched from normal law to "alternate law," a regime with far fewer restrictions on what a pilot can do.

"Once you're in alternate law, you can stall the airplane,"  said one expert.

Before this crash, not one of US Airway's 17 Airbus 330s had ever been in alternate law. Therefore, one of the pilots may have assumed that the stall warning was false.

How can experts learn what happen to train their pilots better?

The engine at the bottom of the ocean.

By 17 June 2009, a total of 50 bodies had been found in two distinct groups more than 50 miles (80 km) apart, and more than 400 pieces of debris from the plane had been recovered.

But the most important thing to find in a plane crash is the black box. Do you know why?

On the 26th of April 2011, after a 12-hour dive by the Remora 6000, the flight data recorder had been found.On 1 May the memory unit was found and lifted on board the Île de Sein by the ROV. 

The flight data recorder was found!

What did the recordings teach experts?

What really caused the crash?