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I think they do this because they want to pretend you are paying attention in the case of an emergency. Once they reach 30k feet, you can use them again.
I love it when they say "put down your reading materials and stop your conversations and listen to this safety briefing" Then they show you how to buckle a seat belt. I don't mean to disparage people from other countries who can't use a seatbelt, but a flight between Chicago and Boise is probably not their first time using a seatbelt. And I know if the plane crashes, I will forget anything printed in the safety placard or told to me, anyway.
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