OMFG. I'd die if someone showed up with a squirrel in the seat next to me. Seriously, if you can't fly without your squirrel, maybe you shouldn't be flying.
The whole emotional support thing is out of control. I totally get that there are legitimate uses of these animals, but all these ridiculous ones undermine those who truly need them. It's got to be something more than a piece of paper you buy off the internet to get an ESA. And, SOME training other than "Fifi helps me." Properly trained service animals are no problem on a plane. All these "pets" disguised as ESA are.
ETA: For fun, I filled out one of these online forms. I literally checked every box that said "got no problems", except a line that said "I was grouchy in the last week" (and then I checked the box that said "a few times" as to frequency). Then, I filled in the box that said "why do you want this ESA certification" and I said "Because I want my dog to travel on the plane with me without paying a fee." And, guess what? I QUALIFIED for an ESA. Nice, eh? Very thorough process. The letter would be on the way to me within 48 hours...faster if I paid a larger fee. Woohoo!!!!
You won the internet today.