Hallo Guys,
I found a way to use the iPad for flying at night.
Go to settings.
General.
Accessibility
Zoom
It is very helpful to select in the menu Accessibility for shortcut "zoom".
Then you have only to press three times the home button.
When the iPad is in the zoom-modus it's not so bright than in the normal modus.
In addition you can use the function for brightness further more.
So far my tip, try it.
Mike‌