There are essentially two reasons airlines ask you to turn on airplane mode and stop playing with your device before take-off and landing: 1/ because 20 years ago, devices such as cell phones could interfere with the aircraft’s systems and potentially wreak havoc on your flight. 2/ The crew wants your undivided attention as the two most dangerous times on a flight are take-off and landing.
Nowadays, with modern phones and airliners, the first justification no longer holds water, so they’ve switched to using the second justification.
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