Cockpit door security is weak
In light of yesterday's tragic events, I hope the airline industry will strengthen their policy. The cockpit door should stay locked from the inside during flight. The door should be a sturdy one. Flight attendents can communicate with the pilot via intercom. The focus on checking passengers for weapons is mistaken, I think. Even the most stringent checks won't help much. A sharpened pencil can be used as a dagger; a length of cord can be used as a garotte. Even without weapons, the flight crew can be overcome by a determined band of madmen. Airliner cockpits must be secured.