Originally Posted by RSSrsvp

Please show us the law that you are referencing as this is the first time that I have ever heard of such a requirement in all of the years I have traveled with my dog. To the best of my knowledge the carryon pet requirements are totally in the domain of the individual airlines. As every airline has a different size for the carryon bag they will allow, the ability of the animal to stand up depends on the height of the bag that your airline allows.