Prohibited items are objects, substances, or materials that regulations bar from being carried on an aircraft, either in the cabin, in checked baggage, or both.
How It Works#
Governments and aviation authorities publish specific lists of items that cannot travel by air. In the United States, the TSA (Transportation Security Administration) and FAA enforce these rules. ICAO (International Civil Aviation Organization) sets international standards through its Technical Instructions for the Safe Transport of Dangerous Goods by Air.
The lists divide items into two broad categories. Some items are banned entirely from all air travel, such as explosives and certain chemicals. Others are restricted, meaning they may travel under specific conditions, in limited quantities, or only in checked baggage.
Lithium batteries are a common example. Spare lithium-ion batteries are generally prohibited in checked baggage but allowed in carry-on bags, because cabin crew can respond faster to a fire in the cabin. The rules exist because these batteries can overheat and ignite.
Security screening at airports enforces these rules for passengers. On the cargo side, airlines and freight forwarders must follow IATA (International Air Transport Association) Dangerous Goods Regulations (DGR), which cover commercial shipments in detail.
Example in Aviation#
A passenger packs a large container of aerosol spray paint in a checked bag before a flight. At check-in, the bag is flagged during screening. The spray paint is both flammable and pressurized, placing it on the prohibited items list. The passenger must surrender the item before boarding.
A similar situation plays out in cargo operations. A freight shipper attempts to book a pallet containing undeclared lithium batteries. The airline's dangerous goods team identifies the shipment during documentation review and rejects it until the shipper provides proper classification, packaging, and labeling.
Why It Matters#
Prohibited items rules exist because aircraft are enclosed environments at altitude, far from emergency services. A fire, toxic leak, or explosion in flight can be catastrophic and nearly impossible to contain. Regulations reduce that risk by keeping the most dangerous materials off the aircraft entirely.
Pilots and cabin crew benefit from understanding these rules too. Knowing what passengers may and may not carry helps crews recognize when a situation needs immediate attention, such as a passenger with an undeclared hazardous item discovered mid-flight.
Key Takeaways#
- Prohibited items are goods banned from aircraft cabins, checked baggage, or both.
- TSA, FAA, ICAO, and IATA all publish and enforce prohibited items rules.
- Some items are banned outright; others are restricted to specific conditions or quantities.
- Lithium batteries, flammable liquids, and explosives appear on most prohibited lists.
- Cargo operations follow IATA DGR, a separate and more detailed framework than passenger rules.