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6. Using Secret Communication Code

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The flight crew does use a secret communication code because there are certain things that they don't want the passengers to know. It is completely understandable because they don't want to cause any panic among the passengers. So, they use certain codes to indicate what's going on. You may hear certain beeping sounds during flight and they are not just some call buttons. According to insiders, the "dings" are used during the takeoff and landing to signal the crew that everything is okay as most dangerous stages are over. There are other bells for severe turbulence, emergency, and also if someone tries to enter the cockpit.