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It makes laugh a lot, 9/11 happen because they used cutter.

Airport security will piss you off for a kid cissor.

But they will let you buy a glass bottle of alcohol in duty free.

That you can break properly and use as a weapon ...

Logic ...

Relevant - This guy built a bunch of weapons from things you can buy in airport shops.

Do they let you carry that own or do they hold that until you get off the plane? The latter was my experience some years ago.

Yep. You can bring two 1.7 oz glass bottles with you to the airport (in case you have a specific shape or kind of glass you'd like).

There are many shops in the sterile area of most airports that sell goods that could be readily transformed into weapons.