Fascinating thread! Bringing it to the present day, Have all these many incidents/tragedies resulted in extra precautions? No I'm not asking for details here. How hard is it now? A peripheral detail of the RAF Voyager excursion in Turkey was that the FO was able to re-enter the Flt deck quickly as it wasn't/isn't normal practice to lock the door. Why not? In the civil world this would be regarded as a major breach yet it escaped comment.