Should emotional support animals be allowed to fly with their owners?

Which of the following is an effective claim for this prompt?

All emotional support animals are sweet and well-behaved, so they would not be a problem.
Emotional support animals are animals that provide comfort to people but aren't medically necessary.
Emotional support animals should be allowed to fly with their owners if they meet certain criteria.
I believe emotional support animals should be allowed to fly because people need them by their side.