My husband and son are VERY allergic to animals. My son's reactions range from the standard sneezing and watery eyes all the way to vomiting and trouble breathing. The airline policies don't seem to take that into account. If my son is stuck in an airplane with an animal (especially a long-haired animal like a Chesapeake Bay Retriever), he could get very ill. It's more than an inconvenience in that case - it's a health issue.

I'm okay with Service Animals. I'd love to see Delta provide proactive notification if a service animal is going to be in the cabin, though. In my son's case (and probably my husband's, too, but he can take care of himself), I would choose to rebook rather than subject him to the suffering. And I would expect that Delta would support that with no cost, even though my son's not a Medallion member.

As for Emotional Support Animals... I think we all know how I feel about them.