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Ripped doctor's letter found in co-pilot's trash
Notes found in the home of the co-pilot suspected in this week's crash suggest he "kept his illness secret," a prosecutor said. FULL STORY | The victims | Cockpit rules change | Watch CNNgo | Coverage
How do you guard against a threat from pilots?
Since the September 11 hijackings 14 years ago, improvements to aviation security have had a strong focus on keeping intruders out of the cockpit.