What is allowed is constantly changing. TSA runs a web site that lays out what they will allow and what they will not. I found it with a Google search and don’t remember what the address is. It’s rumored that the guys at the gate don’t always know their own rules as well as they ought to. But it will at least let you know what’s up!
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When the wolf attacks he will find that some who run with the flock are not sheep!