Some forbidden carry-on items on airplanes include knives and other sharp objects, liquids over 3.4 ounces, flammable items, firearms and ammunition. Much sports equipment is also forbidden, including golf clubs, hockey sticks and baseball bats.
Sharp items that are banned include scissors, box cutters, swords and meat cleavers. Plastic knives and round-bladed butter knives are allowed. Most self-defense sprays are also banned, unless it is under 4 ounces and equipped with a safety mechanism.
Passengers bringing guns and ammunition in their checked luggage should double-check with their airline to ensure their type of rifle or gun is allowed and that they are packed correctly. Passengers should keep in mind that weapons and self-defense sprays are illegal in some countries. Travellers should ensure their item is legal in their arrival destination.
Common lighters are not allowed unless they do not contain fuel. Torch lighters are not allowed in either carry-on luggage or checked luggage. Passengers are allowed one book of safety matches.
For a full list, passengers can check the latest list on the TSA website. The TSA also advises that even if the website allows an item, it might be subject to extra security. The TSA agent has the right to refuse any item on board at security.