The Safety Rule
During takeoff and landing, shades are normally required to be open so passengers and crew can see outside and their eyes can adjust if an emergency occurs. It is one of the few moments when a cabin shares the same view.
The Case for Shade Down
On long flights, a closed shade can reduce glare, help someone sleep, and make it easier to control a personal environment. Travelers managing time zones and fatigue have practical reasons to prefer darkness.
When the Cabin Goes Dark
If every shade closes, daylight disappears and a metal tube crossing the sky can feel like a sealed room. The view, the sense of time, and the shared experience of flight all become secondary to screens and artificial light.
The Window Seat Has the Lever
The passenger by the window controls the shade, but the effect is shared by the row. Sunlight can disturb a sleeping neighbor, while a closed shade can block a view someone hoped to enjoy. A quick glance and willingness to adjust go a long way.
A Practical Compromise
There is no universal etiquette beyond safety instructions. Keep the shade open when it matters, be mindful of direct glare, and remember that the cabin is a shared environment even when the window control is yours.