The IATA dangerous good regulations says that dry ice, in quantities not exceeding 2.5 kg (5 lb) per passenger when used to pack perishables can be carried in either check in or carry on luggage.
Carry on luggage should be packaged so that it permits the release of carbon dioxide gas. Dry ice in checked baggage requires operator approval and each item of checked baggage must be marked “dry ice” or “carbon dioxide, solid” and with the net weight of dry ice or an indication that there is 2.5 kg or less dry ice.
When you want to carry dry ice, contact the airline first, also keep in mind the the airline may permit something, but the TSA
or equivalent may not.
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