Crew meal service is the main weakness in cockpit security. There are protocols that cabin crew can use to pass a message if they are under duress to let the flight crew know of untoward events but if timed right an attacker near the cockpit could get close during crew getting their refreshments passed to them or when flight crew exit the cockpit for comfort stops.
The lack of demands by any terror group would indicate hijacking to be less likely though it can't be ruled out yet.
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