"Ron Natalie" wrote in message
m...
John Ewing wrote:

Simple - there was no requirement to lock the door and the door wasn't
reinforced to prevent intrusion, until after this date.

Not true. The doors have been locked since the seventies.
They weren't overly substantial, nor were there any real
strict procedures to cover the opening of the door during
flight.

Beg to differ, Ron.
Doors were not routinely locked.
Most could be locked, but certainly there was no mandatory requirement for
them to be locked in flight.
I think my statement is correct.

John