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Guarding planes from ground-based threats is everyone's job--and no one's
When civil aviation officials learn of a new danger–like liquid explosives or underwear bombs–national and international agencies respond by issuing rules and restrictions for passengers around the world. But airlines and governments have been slow to address ground-based threats. The downing of Malaysia Airlines Flight 17 on July 17 is raising fresh concerns about who in the complex global aviation system is responsible for defending civilian aircraft against missiles.