Not too long ago - 2012, to be precise - airlines required passengers to switch their phones off entirely. In 2013, after consultations with pilots, passengers, aviation manufacturers, and representatives from mobile technology, the Federal Aviation Administration formally announced that passengers could leave their phones active during flights, as long as airplane mode was enabled. But why? Why is it still so important to use the setting when you fly? Discover some little-known details about this feature in this video.