coming home on a flybe flight after christmas, my daughter was reading her new iPad, in flight safe mode. When the "10 minutes to landing" announcement was made she turned the device off by pressing the button on top of the device, and the screen turned off. However a passing flight crew saw this and insisted that the device be fully powered down. We didn't really know what she was on about, the device was turned off, but the stewardess made a point of showing us that we had to hold down the top button then slide the icon that appeared on screen.
So when is "off" really "off" with these gadgets - when the screen is black or with a full power down?