There are many reasonable health questions asked. Since the number of dogs/other animals on planes has been increasing in the last few years , I think the FAA which is responsible for the regulations with specific regulatiions allowed to be decided upon by the individual airlines should be reviewed on a annual basis. For further information you may want to visit: https://www.faa.gov/about/initiatives/cabin_safety/pets_faq/ At the end of this link there are other sites suggested.
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