I called United, AA, and Southwest. All are not allowing emotional support animals, regardless of size or type of animal. However, they all allow psychiatric service dogs and regular service dogs. My Buddy might qualify, since I did teach him to ground me when I have an anxiety attack. Found this article from the place I got my esa on getting a psychiatric service dog letter. I know you don't technically need it, but I think I will feel more secure having it than not having it. This is definitely better than putting him in the cargo section, please don't judge me. Just sharing what I am doing to make sure that I have what I need.