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There are oodles of threads about this, but most are years old, so...here's my experience from the past two weeks: Filled TWSBI 580 Domestic TSA (MSP): No problems; pretty obvious the pen held less than 3 oz. of liquid. Domestic flight (JFK > MSP): No problems, even though the pen laid on its side the entire flight, in the small overhead compartment. No leaks, no worries. International security (Dublin and Glasgow): No problems; same as domestic U.S. TSA. Side note: You go through x-ray security twice in Dublin, due to U.S. Preclearance. No questions either time. International flight (Dublin > JFK,): No problems at all; kept the pen nib-up the entire time (expect for when in use---only wrote with it after we reached altitude). Filled Visconti Traveling Inkpots Ditto to all of the above. :::whew!::: To be on the safe side, I slipped the TWSBI into a snack size ziplock baggie before traveling. I'm not crazy, after all. Pretty sure keeping the pen nib-up is a wise precaution, no matter what. Am also fairly certain the reason this pen traveled so well while inked is due to the fact it was initially filled using one of the Visconti inkpots (think: vacuum = no excess air to "burp" out). Just my two cents to share with anyone looking for recent feedback. Safe travels!