my guess is dry ice dont know whats allowed on planed though

When I go fishing in Alaska we vacuum seal and freeze the filets. Next pack them in coolers or you can buy insulated boxes in many places up there that will do the job. Now here's the trick. When you fly up pack light and take you clothes and stuff as carry on. Then you can ship 2-50 lb boxes of filets home at no charge. Make sure you weigh them so they are not overweight. My fish has always made it home in great shape with no ice of anykind. When you book your flight go with the fewest plane changes so the baggage apes have less chance to lose your fish.

I used to take suitcases full of salmon to relatives. I did the vacuum pack of fillets, then wrapped each fillet in newspaper and put them in a suitcase so I didn't have to buy insulated coolers. I filled in the crevices with more wadded up paper, then checked the suitcases as baggage. This will keep fillets frozed for at least 24 hours. Try it next time you go to thaw out a fillet, wrap it in a few pages of newspaper and stuff it in a cardboard box in packed newspaper... you won't eat that fillet for a couple of days but you will see how it works.

Don't spend a ton of money with dry ice and all that...plus some companies won't let you ship or fly with dry ice. Take some plastic water bottles and freeze them solid. Put the fish in zip lock bags and either freeze them in a block of water, or get them cold in the fridge. Just before you leave for the airport, put a garbage bag in a cooler and throw everything in and tie the bag shut, and close the cooler and tape it shut. This will last at least a day, depending ont he cooler.

Agreed with DakotaMan and + 1 for you sir!!!