Which statement describes air transport for Division 4 materials?

• A. All Division 4 materials are permitted on planes
• B. Division 4 packing group 2-3 are prohibited on planes
• C. Division 4 packing group 2-3 are permitted with restrictions
• D. Division 4 materials require special handling and packaging

Answer: (D)

Division 4 materials are hazardous because they can ignite, react, or release flammable gases under certain conditions, so air transport requires careful handling to prevent accidents. The key point is that these substances must be treated with specialized packaging and handling procedures to ensure they stay contained, separated from incompatible items, and protected from heat or impact during flight. This is why the correct choice emphasizes that Division 4 materials require special handling and packaging.

In practice, this means using UN-standard packaging, appropriate cushioning, secure closures, proper labeling and documentation, and following the specific packing instructions under IATA DGR. The other statements misstate the safety requirements: some Division 4 materials cannot simply be “permitted” without conditions, and saying they are only “permitted with restrictions” or that all are allowed ignores the need for the specialized packaging and handling that these materials require.