A Lieberma writes:

Yep, typical response of a person who never stepped into a plane.

No, typical response of someone who has actually looked at the comm
stack in a commercial airliner.

Ya know, safety announcements just may have to be made if something
catastropic happens to the electrial system and flight attendence have to
bark out orders using their own voices. I.E evacutation orders.

Yes, but not every announcement is an evacuation order. Announcements
can be made that override all audio channels.

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