We are in a tech savvy world, but there still are limitations. No matter how much you know and show off using the services, there will be a restriction you'll face one or the other time. Like when you travel in an aeroplane, you are asked to switch off your phone or put it on the 'Airplane Mode'.
This is been going around since like forever and it is mandatory too, why? Well, you will know that shortly. There are only a few people who understand it while the others don't tend to know the real meaning behind it and keep their device ON anyway which let me tell you is dangerous. Some people seen try to see if they can send a message from their phone while they are on a flight but the result is not good. BEWARE, guys, your mistake could result in a plane crash.
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Well, that buzzing sound is natural to irritate the pilots and air traffic controllers while placing any emergency calls. The unpleasant sound may also hamper the transfer of any important information within the preferred time which may fail the authorities from preventing any mishappening. And yes it is not safety critical but annoying for sure.
The sounds disturb their hearing. And it even makes it difficult for them to pass on any important instructions.
Ask them not to use their phone and stay patient for the sake of everyone's life.