I have read all sorts of things about the danger of Air travel, however I finally decided to fly with my pet since my Vet has show dogs which fly all over the world to earn their medals. My pup was perfect on the way there, but came back terrified. I think the pressure was off in Cargo area on the second flight, but there is no way I can really know what the difference was. A friend told me that only certain models of airplanes actually have a controlled pressurized Cargo space. Does anyone know exactly what the deal is? ARE there only few models that have the proper space? WHAT makes dogs terrified, the changes in pressure? How can I ensure a better flying experience for my boy next time?