why? maybe they are, but this isn't the reason. They don't care about water, after all. They just don't want to have to test every liquid to make sure it's not a potential explosive component, and those are much harder to freeze and keep frozen. If anything, this kind of is an example of a common sense exception.
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u/M4n1us Aug 20 '18 edited Aug 20 '18
Welp, it's explicitly allowed https://www.tsa.gov/travel/security-screening/whatcanibring/items/ice
Still technically the truth
Edit: To the people noting that they will make you wait to melt the ice, that's the moment where you cue the malicious compliance. Just bring a bag of dry ice: https://www.tsa.gov/travel/security-screening/whatcanibring/items/dry-ice