One day perhaps your iPad can stay on during takeoff
Perhaps years ago in the early days of portable electronics, there was some small chance of a device such as a mobile phone interfering with avionics inside of an aircraft. Today, I hardly think that's an issue, yet the FAA still bans the use of gadgets such as tablets, portable game systems, and lots more while airplanes are taxiing, taking off, and landing.
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Despite the fact that passengers are banned from using personal electronics during some parts of the flight, pilots were recently allowed to use the iPad in any flight phase. The pilots use the tablets to store digital versions of charts and flight manuals rather than paper versions to reduce workload and save weight. The FAA has recently promised to take a "fresh look" at allowing certain gadgets to be used in all aspects of flight. I would expect tablets and other devices to eventually be allowed to be used in all aspects of flight.