Air China said it conducted an investigation after the photo surfaced . It said that the lock was in the 'normal ' position during take-off . Photo sparked debate on Chinese social media after recent incidents . Comment:
Air China said it conducted an investigation after the photo surfaced . It said that the lock was in the 'normal ' position during take-off . Photo sparked debate on Chinese social media after recent incidents . Passengers have opened emergency exits on at least five occasions .