Paris airport workers in the spotlight after EgyptAir crash

But aviation expert says security breach at Charles de Gaulle airport would be 'completely incredible' as it has the 'highest standards' in world.

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It could be weeks before officials know why Egyptair Flight MS804 vanished from the sky on Thursday morning, with 66 people on board. But French authorities have begun hunting for a cause, including the possibility an explosive device might have been placed on board the Paris-Cairo flight at Charles de Gaulle airport, reports Time.