it is important to note that carrying any type of knife or sharp object onto an airplane is prohibited by the Transportation Security Administration (TSA) in the United States, and by similar organizations in other countries. Attempting to do so can result in serious legal consequences and may also put other passengers at risk.

With that said, it is important to understand the rules and regulations regarding carrying knives on planes. In general, knives with blades longer than 6 cm (2.36 inches) are not allowed to be carried in your carry-on luggage or checked baggage. This rule applies to all types of knives, including folding knives, fixed-blade knives, and multi-tools.
The TSA also provides additional guidance on what types of knives are allowed and not allowed on flights. For example, pocket knives with blades shorter than 6 cm (2.36 inches) and without a locking mechanism are generally allowed in carry-on luggage. However, knives with locking blades or blades that can be opened with one hand are prohibited, even if they are under the 6 cm limit.
It’s worth noting that these rules can vary depending on the airline and the country you are flying from and to. Some countries may have more strict rules on carrying knives on planes, while others may have more lenient rules. It is important to check the regulations of the specific airline and country you are traveling with before attempting to bring any knives or sharp objects on a plane.
In addition to knives, there are other types of sharp objects that are prohibited from being carried on airplanes. These include scissors with blades longer than 4 inches, razor blades, box cutters, and any other types of sharp objects that could be used as weapons. Additionally, sporting goods such as baseball bats and golf clubs are also prohibited from being carried on as carry-on luggage.
If you do need to travel with a knife or other sharp object, it is best to pack it in your checked baggage. However, it is important to properly package the item to avoid any accidental injuries during baggage handling. The TSA recommends wrapping the sharp object in a sheath or cardboard, then placing it in a sturdy box or container to protect it from damage.
In summary, carrying knives on planes is generally not allowed. If you do need to travel with a knife or other sharp object, it is best to pack it in your checked baggage, following the guidelines of the airline and country you are flying with. It is important to remember that attempting to bring a prohibited item on board can result in serious legal consequences, as well as putting other passengers and crew members at risk.