American Airlines Service Animal Policy
Service animals, including emotional support animals, are welcome at no charge if they meet the requirements. They must fit on your lap, at your feet, or under the seat, and cannot block the aisle. For security reasons, you won’t be able to sit in an exit row when traveling with your service or emotional support animal. To travel with an emotional support or psychiatric service animal you must provide recent documentation (within 1 year) to Reservations at least 48 hours before your flight.
Doctor's letter requirements
State you have a mental or emotional disability recognized in the Diagnostic and Statistical Manual of Mental Disorders Show the need for emotional support or psychiatric service animal for air travel and / or activity at your destination Proof of their licensing as a mental health professional or medical doctor (including date, type and state of license) and that you're a patient If we’re unable to validate your documentation or it wasn’t received at least 48 hours before your flight, the animal may need to be checked and travel in a kennel.