In general, you are prohibited from traveling with sharp objects in your carry-on baggage; please pack these items in your checked baggage.
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TSA used to allows knives with blades that are 2.36 inches (6 cm) or less in length in carry-on. However, that is a thing of the past. Now they ban all knives in hand luggage and on your body. You can only check them in.
If you accidentally go through security with your pocket knife, you'll likely be given four options: Take the item back and check it in your luggage. Give the item to someone who is seeing you off, if they are still at the airport. Take the item to your car.
To play it safe, always fly with your Leatherman in checked baggage. Your Leatherman multi-tool has been by your side through lots of adventures and has helped you save the day. But for your upcoming plane trip, the best thing to do is to plan on putting it inside your checked baggage.
It is illegal even to take a forbidden object to a checkpoint, much less take it on a plane. (For a list, visit www.tsa.gov.) Doing so can subject you to civil fines of up to $10,000, plus possible criminal prosecution.