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In this March 22, 2016 file photo, passengers check into their flights near a security checkpoint sign at O'Hare International Airport in Chicago. The arrest of an airline mechanic suspected of being sympathetic with terrorists and charged with sabotaging a jetliner has renewed fear about the “insider threat” to aviation security. Despite security upgrades since the hijacking terror attacks of 2001, breaches including a gun-running operation at the nation’s biggest airport illustrate the possibility that a well-placed airline or airport employee could bring down a plane. (AP Photo/Teresa Crawford, File)

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The arrest of an airline mechanic suspected of being sympathetic with terrorists and charged with sabotaging a jetliner has renewed fear about the "insider threat" to aviation security.

By DAVID KOENIG Associated Press September 21, 2019