Air transport moves thousands of products that can create hazards if they are packed, declared or handled incorrectly. Batteries, fuels, chemicals, compressed gases, radioactive materials and many other articles can be classified as dangerous goods because they present risks during transport. The International Civil Aviation Organization’s Technical Instructions for the Safe Transport of Dangerous Goods by Air provide the detailed international framework used to control those risks, while the 2025–2026 edition of Doc 9284 is applicable from 1 January 2025 through 31 December 2026. [1]
Airlines do not manage dangerous goods through one simple banned-items list. The system classifies substances and articles, establishes whether they may travel on passenger or cargo aircraft, defines quantity limits and packaging, requires marks and labels, controls documentation and specifies how operators accept, inspect, load and inform flight crews. IATA’s Dangerous Goods Regulations translate the ICAO framework into an operational publication widely used by airlines and cargo organisations; the current 67th edition applies for 2026. [2]
ICAO Annex 18 sets the international foundation
ICAO Annex 18 establishes the broad principles for safe transport of dangerous goods by air. ICAO explains that the detailed provisions are then contained in the Technical Instructions, Doc 9284. States implement the framework through national regulations and oversight, while operators incorporate the requirements into their procedures and training. [3]
The international system matters because a shipment can cross several countries and airlines during one journey. Standard classification, labels and documentation allow each organisation in the chain to understand the hazard consistently rather than inventing a separate system at every airport. [1]
Dangerous goods are divided into hazard classes
The regulations group dangerous goods according to the type of hazard they present. Categories cover explosives, gases, flammable liquids, flammable solids and related substances, oxidisers and organic peroxides, toxic and infectious substances, radioactive material, corrosives and miscellaneous dangerous goods. Each class can contain divisions and specific entries whose transport requirements differ. [4]
Classification is essential because two items that appear equally ordinary can require very different controls. A consumer aerosol, a spare lithium battery and a laboratory chemical may all be regulated, but the packaging and quantity rules reflect their individual hazards. The shipper has to identify the correct classification before the airline can determine whether the item is acceptable. [2]
Some dangerous goods are forbidden entirely
ICAO explains that dangerous goods can be prohibited from air transport or permitted only under specified conditions. Articles whose hazard cannot be reduced to an acceptable level by packaging, quantity restriction or handling controls may be forbidden under normal transport. Other items require explicit State exemptions or approvals before carriage. [3]
This prevents commercial pressure from turning every substance into a routine shipment. The regulations define the boundary of what normal airline operations are designed to carry. If an item falls outside those conditions, the airline cannot make it acceptable merely by charging a higher freight rate or placing it in a stronger box. [1]
Passenger aircraft and cargo aircraft can have different limits
Some dangerous goods may be carried on cargo aircraft in quantities that are not allowed on passenger aircraft. This reflects the different exposure and operating environment associated with passengers and crew. ICAO and IATA packaging instructions therefore identify whether an item is permitted on passenger and cargo aircraft, cargo aircraft only, or forbidden. [2]
A cargo-aircraft-only label does not mean the substance is uncontrolled once passengers are absent. Packaging, quantity, handling and loading requirements still apply, and cargo aircraft crews remain protected by the same fundamental dangerous-goods safety framework. [1]
Packaging is designed around the hazard
Dangerous-goods packaging has to contain the material under the conditions expected during air transport. Depending on the substance, the regulations can specify tested UN packaging, inner and outer packaging combinations, absorbent material, pressure resistance, closure methods and maximum net quantities. IATA’s DGR includes packing instructions that convert the classification into practical requirements for the shipper. [2]
Air transport is particularly demanding because packages experience pressure changes, vibration, handling and temperature variations. A container that is adequate on the ground may not be acceptable for flight if it leaks, vents dangerously or cannot withstand the required conditions. [1]
Marks and labels tell handlers what is inside
Packages containing regulated dangerous goods carry required hazard labels and marks so workers can identify the nature of the risk. The markings can include UN identification numbers, proper shipping names, orientation arrows and other handling information, while diamond-shaped hazard labels provide a standard visual indication of the class. [4]
These symbols are operational information rather than decorative warnings. They influence where a package can be stored, whether it can be placed near incompatible materials and how personnel should respond if the package is damaged or leaking. [3]
Documentation creates a traceable declaration
Many regulated shipments require a shipper’s declaration containing the information needed to confirm classification, quantity, packing instruction and other transport details. The shipper is responsible for preparing the shipment correctly before it is offered to the airline. The operator then checks the documentation as part of acceptance. [2]
Documentation is important because the airline cannot inspect the chemical composition of every sealed package. The system depends on a controlled chain in which the shipper declares accurately, trained acceptance staff verify the package and documents against the regulations, and the operator records what has been loaded. [1]
Airline acceptance staff use a formal check
An airline does not simply accept a dangerous-goods package because it has a label. Trained personnel check the documentation, package condition, marks, labels and other required details before acceptance. IATA provides dangerous-goods acceptance processes and checklists as part of the DGR operating framework. [4]
If the shipment does not meet the requirements, it can be rejected until the discrepancy is corrected. This is a preventive safety layer: finding a missing label or unsuitable package in the cargo terminal is much safer than discovering the consequence after the aircraft is airborne. [2]
Incompatible dangerous goods must be separated
Some substances can react dangerously if they leak and mix. Dangerous-goods rules therefore include segregation requirements controlling which hazard classes may be loaded near one another. Operators use labels and shipment information to keep incompatible materials apart during storage and aircraft loading. [1]
Segregation is another reason precise classification matters. If an item is declared under the wrong hazard class, the loading system may fail to apply a separation rule designed to prevent a chemical reaction. Accurate shipping information therefore protects the entire cargo load, not only the individual package. [2]
The flight crew receives information about loaded dangerous goods
When regulated dangerous goods are carried as cargo, the operator provides the pilot in command with information about the relevant shipments in accordance with the Technical Instructions. This allows the crew to know what hazards are on board and where they are loaded. [1]
The information can be important if a cargo warning, diversion or ground emergency develops. Fire services and other responders may also need to know what materials are aboard. Dangerous-goods documentation therefore continues to have operational value after the cargo doors are closed. [4]
Passenger baggage follows a different acceptance path
Passengers do not complete a cargo shipper’s declaration for ordinary baggage, but dangerous-goods restrictions still apply. Airlines provide information at booking, check-in and baggage acceptance identifying articles that are forbidden, restricted to carry-on baggage or permitted only under defined conditions. [5]
Some common items are permitted because the regulations provide passenger exceptions at limited quantities. Others require airline approval. The exact rules can depend on the article’s energy rating, quantity, purpose and whether it is carried in the cabin or checked baggage. Passengers therefore need the current airline and regulatory guidance for the specific item rather than assuming every household product is unrestricted. [4]
Spare lithium batteries normally belong in carry-on baggage
IATA’s passenger battery guidance states that spare lithium batteries and power banks must be carried in carry-on baggage rather than checked baggage, subject to the applicable size and quantity requirements. The terminals must be protected against short circuit. [5]
The reason is operational visibility and access. If a battery overheats in the cabin, trained crew can identify and respond to the event. A similar event hidden deep inside checked baggage is harder to reach. The requirement therefore manages where the hazard is located, not merely whether the passenger owns the battery. [6]
Lithium batteries receive dedicated regulatory attention
Lithium cells can store significant energy and damaged or defective cells can enter thermal runaway. IATA maintains dedicated lithium-battery guidance covering classification, packing, marking and passenger carriage. The rules distinguish batteries installed in equipment from spare batteries and can vary according to lithium content or watt-hour rating. [6]
Battery rules are updated as technology and transport experience evolve, which is why airlines use the current DGR edition rather than relying on old internet lists. A battery product that was acceptable under a previous standard can be subject to different packaging or state-of-charge requirements in later editions. [2]
Undeclared dangerous goods are a major challenge
The dangerous-goods system depends on recognising that an article is regulated. Shipments described only as “parts,” “samples” or “equipment” can contain batteries, chemicals or gas cylinders whose hazards are not obvious from the outer box. ICAO’s air-cargo safety work therefore emphasises supply-chain awareness and compliance as part of preventing undeclared dangerous goods. [7]
Airlines and freight forwarders use training, questioning and screening processes to identify suspicious or incomplete declarations. These controls cannot replace the shipper’s legal responsibility, but they can provide another opportunity to intercept a misdeclared package before flight. [4]
Training is role-specific
Dangerous-goods training is not one identical course for everyone in an airline. Personnel need competence appropriate to the functions they perform. A cargo acceptance agent requires detailed classification and packaging knowledge, while cabin crew need to recognise passenger items and respond to in-flight dangerous-goods events. Ground handlers, loaders, dispatchers and flight crew each have different operational responsibilities. [1]
IATA’s modern competency-based training approach focuses on what an employee actually needs to perform safely in their role. Recurrent training is important because the rules and products in the market continue to change. [4]
Cargo screening and dangerous-goods acceptance solve different problems
Security screening aims to identify prohibited security threats, while dangerous-goods acceptance verifies compliance with transport-safety rules. The two functions can overlap physically in a cargo facility, but a shipment that passes security screening is not automatically compliant with dangerous-goods regulations. [7]
Likewise, a properly declared dangerous-goods shipment still needs normal aviation-security controls. Safe cargo transport depends on both frameworks working in parallel. [7]
Operator variations can be stricter than the basic rules
Airlines can publish operator variations that impose additional restrictions beyond the baseline DGR. A carrier may decline a particular commodity, limit quantity further or require extra advance arrangements because of its aircraft, network or handling capability. Shippers therefore check both the general regulation and the airline’s specific requirements. [2]
This is why a package accepted by one airline is not automatically guaranteed acceptance by another. Compliance creates eligibility for transport under the applicable framework, while individual operators can make more restrictive commercial or safety decisions within that framework. [4]
Damaged packages can be rejected even when paperwork is correct
Acceptance staff inspect the physical condition of dangerous-goods packages. Leakage, damaged closures, crushed packaging or incorrect marks can make a shipment unacceptable even when the declaration itself has been completed correctly. The package must remain capable of performing the containment function assumed by the regulation. [2]
This control continues during handling. If a package is damaged after acceptance, personnel follow procedures for isolation, assessment and reporting rather than automatically loading it because it had previously passed the check. [1]
The rules extend through the whole logistics chain
Dangerous-goods safety begins before the airport. Manufacturers, distributors, shippers, freight forwarders, cargo agents, ground handlers and airlines can all influence whether the shipment reaches the aircraft in a compliant condition. ICAO’s framework assigns responsibilities through this chain so safety does not depend solely on the person loading the final container. [7]
This distributed responsibility is especially important in global e-commerce, where packages may pass through several companies before entering an airline cargo system. The airline’s acceptance process is a critical barrier, but it is most effective when upstream declarations and packaging are already correct. [4]
The rules are updated regularly
ICAO updates the Technical Instructions on a two-year cycle, while IATA publishes a new DGR edition annually. That schedule allows the framework to incorporate new products, revised test standards, operational experience and changes agreed by States and industry. [1] [2]
As of 2026, operators therefore work from the 2025–2026 ICAO Technical Instructions and IATA’s 67th DGR edition. Quoting an older packing instruction or battery allowance without checking the current edition can create incorrect advice even if it was once valid. [2]
The simplest accurate explanation
Airlines control dangerous goods by turning each hazardous article into a standardised transport problem. The substance is classified, checked against passenger- or cargo-aircraft restrictions, packed to a specified standard, marked and labelled, documented, accepted by trained staff and loaded according to segregation and handling rules. [1]
Passenger baggage uses the same safety logic through a different process: travellers are told which items are forbidden, which need airline approval and which must stay in the cabin rather than checked baggage. The system is deliberately layered because no single label, scanner or fire bottle can make a dangerous material safe by itself. Safe carriage depends on accurate declaration, packaging, training, loading and operational information all working together. [4]
Verified Sources / References
- ICAO — Technical Instructions for the Safe Transport of Dangerous Goods by Air, 2025–2026 Edition
- IATA — Dangerous Goods Regulations, 67th Edition 2026
- ICAO — Annex 18: The Safe Transport of Dangerous Goods by Air
- IATA — Dangerous Goods Programme
- IATA — Passenger Baggage Battery Guidance
- IATA — Lithium Battery Guidance
- ICAO — Air Cargo Safety
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