CNN Erin Burnett OutFront March 7, 2015 00:58:00
By one of the pilots. >> this is where the mystery starts because what happened? >> reporter: johnson suspects a midair emergency or a deliberate act in the cockpit depressurizing the cabin at high altitude. oxygen starvation, highypoxia. it's happened before. helios airways lost pressure. the crew lost consciousness and the plane with 121 people slammed into a mountain. golfer stewart's jet prepressurized after takeoff. the plane flew without a pilot for four hours before crashing into the field. kept those ghost planes in the air long after all aboard were dieing or dead. >> if there's not a...