We frequently hear tragic news stories involving animals traveling in airplane cargo holds, and it’s no wonder—these animals are exposed to lots of dangers in transit. They can be left on the tarmac in the hottest summer months, transported in unsafe carriers that do not meet humane standards, or be carelessly lost in the shuffle of air cargo traffic.
http://blog.aspca.org/content/take-action-animals-flown-cargo-get-first-class-upgrade