Fact is before 9/11 some carriers required a flight attendant to come into the cockpit whilst one of the flight crewmembers left the cockpit. Check your company manual.
It was not for security reasons back then as it is now.It was in the event the remaining crewmember became incapacitated failure of the auto-pilot, or the key did not work.
Now a day’s security is also an issue.
Last edited by captjns; 12th Jun 2015 at 15:08.