FILE - In this March 23, 2014 photo, a woman walks past a message board for passengers aboard a missing Malaysia Airlines plane, at a shopping mall in Kuala Lumpur, Malaysia. With no answers yet in the disappearance of Malaysia Airlines Flight 370, investigators have said they’re considering many options: hijacking, sabotage, terrorism or catastrophic equipment failure. Nobody knows if the pilots are heroes who tried to save a crippled airliner or if one collaborated with hijackers or was on a suicide mission. The mystery has raised concerns about whether airlines and governments do enough to make sure that pilots are mentally fit to fly. (AP Photo/Lai Seng Sin)
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