After all the planejackings in the ME during the 70’s, 9/11 and other terrorist attacks involving aircraft and the FINALLY put locks on the cockpit doors.
One of the prime reasons they did not beef up the security of the cabin doors is that algore was in charge of the airliner security committee. The airline companies did not wish to pay for the upgrade in security and just before the committee recommended to not require an upgrade, the airline industry coincidentally donated a few 100K to the Clinton Campaign.