This New York Times article discusses tablets, phones, and e-book readers on planes. It concludes with "...there will eventually be an episode on a plane in which someone is seriously harmed as a result of a device being on during takeoff. But it won’t be because the device is interfering with the plane’s systems. Instead, it will be because one passenger harms another, believing they are protecting the plane from a Kindle, which produces fewer electromagnetic emissions than a calculator."