I'm flying in June from Fukuoka, Japan to Tokyo, then Tokyo to LA, then LA to Chicago, then Chicago to Belgium. I am flying on American Airlines. American will not allow any animals to be in the cabin during international flights. The Japan airlines also will not allow animals in the cabin during these flights. So, our little 9lb poodle will have to be in cargo for all the flights except for the flight from LA to Chicago. All the flights (even the US flights) require a vet health certificate for her travel. She also will require a rabies vax and a microchip (we are also getting a FAVN test done for our trip to Europe). The Japan flights require almost $500 as a fee. All the other flights are requiring $150 per flight. There are three ways to send your pet. You can fly with your pet in the cabin under your seat in an airline approved carrier, cargo, or as an extra baggage. When we called the airline, they kept telling me I had to call cargo. . .and I'd say well, I just want it known that I'm bringing a pet; then they'd tell me to call cargo. Finally the man at cargo explained the different ways of bringing pets and told me that reservations always tries to get everyone to send their pets cargo. Sending cargo is more expensive and from what I can tell, it isn't any better than flying with your pet as extra baggage. The only thing is you have to be with your pet if they are going extra baggage. In the summer, airlines will not let your pet fly (except in the cabin) if the temp at either location is over 85 degrees. Also, most airlines will not allow pets to fly if they've been drugged at all since breathing can be a problem. . .in fact, AA says I will have to sign a form saying our dog hasn't been drugged with anything. Oh, if your dog isn't fixed, and is female, they don't want her flying when she's in heat since it can be more stressful on her body.