TSA rules are clear, knives of any size or kind are not allowed to be carried on planes. The only way you're getting it on is in a checked bag, or if the agents miss it during screening.
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Checked Bags: Yes Except for plastic or round bladed butter knives. Any sharp objects in checked bags should be sheathed or securely wrapped to prevent injury to baggage handlers and inspectors. For more prohibited items, please go to the 'What Can I Bring?'
In the United States, the TSA allows certain knives to be carried on planes, but only if they are less than 2.36 inches in length. These are known as “hobby knives” or “folding knives” and are allowed in your carry-on luggage.
As a result, prohibited items may result in both a TSA civil enforcement action and a criminal enforcement action. Before leaving home, remember to check your baggage to ensure you are not carrying any prohibited items to avoid a possible arrest and/or civil penalties.
The TSA requires you to declare firearms, large quantities of medications, and other items, but not sharp objects. However, we would advise that you voluntarily declare knives at the check-in desk, especially if you're flying internationally.
In general, you are prohibited from traveling with sharp objects in your carry-on bags. Multi-tools (multipurpose tools) with knives of any length are prohibited. Please pack these items in your checked bags. Multi-tools (multipurpose tools) with scissors less than 4 inches may be placed in carry-on bags.
No, you cannot bring a Swiss Army Knife on a plane. A Swiss Army Knife, pocket knife, firearms, or any weapon must be placed in your checked baggage, and you must follow TSA guidelines for transporting weapons on a plane. As an EDC nut, I hate to travel without a knife.
Firearms, ammunition, and fireworks are prohibited, as are all knives and safety razors (including pocket knives and Swiss Army knives). Straight razors and replacement blades for straight razors are also not allowed. Most tools also cannot be packed in carry-on luggage, as they have the potential to cause harm.