Doesn't the door require two latches to open? Maybe not... But it does take a bit of extra strength than opening a bathroom door. The speculation about an emergency exit being removed is plausible, - and much easier. But how could it not have been noticed - especially in Coach? I suppose with no stops, it's possible that all coach pax were asleep at the same time. Perhaps a sleeping gas was introduced into the cabin and all the passengers were in a deep sleep when the culprit came aboard.
It was a dark and stormy night. Suddenly, a window popped out.
"IF" it was in coach, there is
no possible way an emergency window could have been popped out, and no one noticed, unless the coach car was virtually empty, and the only pax were at the extreme other end of the car. The wind noise alone, let alone the wind itself, and the sound of the horn....?
Papa took her down to the lower level, said "let's open the dutch door like we used to honey, smell that fresh Georgia air.......Step a little closer"....
PUSH...... close door and dog the latches,.............."Good nite hon......"