some airlines require that all windows must be open during takeoff and landing. Some (I’ve seen it in US) require windows to be closed. Why?

Question

some airlines require that all windows must be open during takeoff and landing. Some (I’ve seen it in US) require windows to be closed. Why?

In: Other

Answer 1

Here in Arizona, they tell us to close the shades after we land to help keep the plane cooler while it is on the ground. Especially in the summer. But I have never had them tell me to close the shades while we land.