breadnatty08
pain rustique
This seems to be the most logical reasoning they mention:

The wife always does what BB says. Puts in airplane mode, turns off screen during takeoff/landing but not completely off. So far, we've survived.It's about stowing: If there's an emergency, the airline doesn't want the compounding fact of phones and tablets whipping through the air.

I never turn my device all the way off on flights. Oops 
Power button didn't work. Had to pull the battery and it took forever to boot back up. Seems to be ok now but it was not a cool feeling to have a dead phone for a bit.
She was pretty impressed and wished me a nice night.