How many pets maximum can travel with one person?

How many pets maximum are allowed to travel on a flight with one person?|||at about three. according to my companion. XD|||Check with the individual airline, all their rules are different about what can be in the cabin and what must go in cargo. Also all the animals must have current (30 days or less) medical certificates from a veterinarian stating that they are healthy and all shots are up to date. This would be for domestic flights. International flights are subject to the rules of the country you are going to and it is inadvisable to try to take domestic pets overseas because of extended quarantine policies.|||If you have a big enough boat.....apparently two off each species!