do they still pack lobsters in dry ice? the reason i ask is iirc, you are allowed to pack with dry ice.
i can't remember where i grabbed this from and my bad as i usually have a link to go with my copy 'n pastes but.....
Dry Ice (frozen carbon dioxide): Up to four pounds (1.8 kg) may be carried on board for packing perishables providing the package is vented
also, there is
this thread and
this post which links to
this from the faa
n.b. dry ice is frozen C02 which is a gas and not a liquid, gel or aerosol