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I suggest you go to https://www.ipata.org/ to find pet shippers and then write or call them to figure out what you need.

Haven't yet shipped my dogs as I'm still doing some research, but that site has helped having a place to start the research.

I suggest you find an airline that will let you purchase seats or allowances to travel with the pets in the normal cabin next to you. After all, they are anxious and will really be quelled by being next to you during something nerve-wracking like a flight.

Yes! My friend just launched Avvinue (https://www.avvinue.com) to solve this exact problem.