In the latest attack in Istanbul, the suicide bombers struck not inside the airport but outside, where people were queuing at the first checkpoint to be security-screened to go inside.
The chief executive of Intelligent Risks, Neil Fergus, has advised the Australian government on airport security, including contributing to the Wheeler Review a decade ago.
He tells Rick Feneley the queuing outside only made people easier targets for attack if intelligence had not done its job.
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