Most airlines require pets to travel as manifest cargo i.e. in the hold of the plane. The terminology conjures up images of treating them as mere luggage but this is not the case. Every pet flies in an oxygenated, temperature-controlled, and pressurized environment, just like in the normal passenger cabin. International Air Transport Association - Live Animals Regulations are the leading standards for transporting pets on commercial airlines, and their main objective is to ensure that all pets are carried safely and humanely by air. These regulations include up-to-date airline and government rules about the transport of live pets, requirements on marking & labeling, handling, information on the necessary documentation needed when carrying live pets, and comprehensive classification of thousands of pets species along with the container specifications required for their travel. Some airlines will allow some pets to travel in the normal passenger cabin, but rules vary widely between airlines and destinations.