Final answer:
Certain dangerous goods are not allowed to be transported by air, including most explosives and security-type attache cases with alarms, despite the existence of strict regulations for packaging and documentation of hazardous materials for air transport.
Step-by-step explanation:
Yes, there are certain dangerous goods that are not permitted for air transport under any circumstances. Some examples of items that are strictly prohibited include most of the explosives, security-type attache cases with incorporated alarms, and certain other hazardous materials. These regulations are in place to ensure the safety of the aircraft, its crew, and passengers as well as the environment around the airports.
Despite rigorous regulations related to the packaging, marking, and documentation for the transportation of dangerous goods, not all can be transported by air. For those materials that can be transported, it must be done in accordance with the International Air Transport Association (IATA) Dangerous Goods Regulations, which include specifications for cargo holds and considerations if the goods are transported with vehicles, animals, or within proximity to roadsides and trails.