You can use tablets gate-to-gate as long as they are in 'airplane mode' below 10,000 feet (and not connecting to a cellular network above that, although it's fine to connect to a cellular network when taxiing to the gate on arrival but not when taxiing from the gate on departure). You cannot use a laptop except above 10,000 feet because of fear of it becoming a projectile in an emergency. You can use a hardcover book despite the ability for it to become a projectile in an emergency. Those quirks I will leave aside for the purpose of this post. What I want to know is, what is a laptop and what is a tablet? Put a different way, are the smallest laptops banned because of the way the screen opens relative to the keyboard? And the largest tablets are ok? And perhaps more importantly, what about a laptop that converts into a tablet? Can it be used as long as it is in tablet mode? The electronics rules have me wanting a tablet, which I haven't cared about before, but I also have no desire to carry more than one device. I've been happy with my 2 year old Lenovo u300s ultrabook as a single device solution. I'm tempted though by the new Lenovo Yoga 2 Pro -- i7 processor, 8gb ram, 521gb solid state drive.. Windows 8.1, touch screen, and flips over to become a tablet. Think I could get away with that on takeoff and landing?