Which statement best describes the treatment of dangerous goods on passenger flights?

• A. They are always prohibited.
• B. They are allowed with strict conditions for all items.
• C. They are prohibited or heavily restricted with occasional exceptions to a few items.
• D. They are prohibited or heavily restricted on passenger flights; only select items may be allowed under strict conditions.

Answer: (D)

On passenger flights, dangerous goods are treated as a safety risk that must be tightly controlled. The reality is that most dangerous goods are prohibited or heavily restricted from being carried on passenger aircraft, and only a very limited set of items may be transported under strict conditions. Those conditions require appropriate classification, proper packaging (often UN-standard packaging), correct labeling, complete documentation, specific quantity limits, and trained personnel to handle and authorize the shipment. This reflects why the best description is that dangerous goods are prohibited or heavily restricted on passenger flights; only select items may be allowed under strict conditions. The other options imply blanket allowances or broader exceptions that don’t align with the safety-first framework governing passenger air transport.