I reckon the pilot hijacked the plane, tried to fly it somewhere, his plan didn't work for one reason or another then ended up in the sea. Reckon they will find the black box, some French surrender monkey plane crashed in the sea, took them 2 years to recover the box and managed to gain some info about the accident. It's a sad story if it was a sinister plot in some way, just hope they find a plausible explanation for the victims families.