> That’s one of the reasons you’re required to open them when you take off and land. I've heard this was more for the reason of passengers safety being able to

> That’s one of the reasons you’re required to open them when you take off and land. I've heard this was more for the reason of passengers safety being able to see whats going on outside - i.e. engine smoke, pieces of wing coming off, etc to let the crew know and in an emergency landing being able to tell what is outside (fire, water, militant guerrillas)