Items that are banned from airplanes, including checked and carry-on baggage, include explosives, some flammable items, chemicals, recreational oxygen and spillable batteries. Chlorine for pools and spas, flares, liquid bleach, and vehicle airbags are also prohibited, as are all compressed gas cylinders, including fire extinguishers. Flammable liquid, gel or aerosol paint, strike anywhere matches, lighter fluid, and realistic replicas of incendiary devices are not allowed on airplanes.
Firearms and related items can only be brought aboard as checked luggage, including ammunition, BB guns, firearms, flare guns and firearms replicas. Pellet guns, starter pistols and parts of guns or firearms also are not allowed in carry-on baggage. All guns and firearms must be unloaded and packed in protective cases approved by the Transportation Security Administration.
Tools that are larger than 7 inches in length, and hammers, axes, hatchets, saws and drills of any length, are restricted to checked luggage, as are drill bits and crowbars. The same restriction applies to martial arts items, including billy clubs, brass knuckles, nunchucks, throwing stars and similar weapons. Self-defense sprays, such as pepper spray, are also restricted to checked luggage. Gas cartridges, snow globes, gel candles, and non-flammable liquid, gel or aerosol paints are similarly restricted.