Here's the real reason to turn on aeroplane mode when you fly

We all know the routine by heart: "Please ensure your seats are in the upright position, tray tables stowed, window shades are up, laptops are stored in the overhead bins and electronic devices are set to flight mode", but is the final part reasonable? Doug Drury explains. 
We all know the routine by heart: Please ensure your seats are in the upright position, tray tables stowed, window shades are up, laptops are stored in the overhead bins and electronic devices are set to flight mode, but is the final part reasonable? Doug Drury explains. 

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