Can an Airline Deny My Service Dog to Fly?

Airlines may deny a Service Dog to Fly if the Dog violates Safety Requirements: If the Dog is too big, too heavy, is ill-behaved (excessive barking, growling, jumping, lunging, nipping or biting) or appears unhealthy or unclean.

Can my ESA Be a Psychiatric Trained Service Dog for Flying?

Yes, with proper training your ESA can become a Trained Service animal allowing your animal to travel in cabin free of charge. There are no certification requirements. Airlines cannot deny your service animal based on breed but they are allowed to restrict service animals to Dogs and deny boarding based on behavior.
Airlines recognize only Dogs as Service Animals.