There are limits to size. Why wouldn’t there be? Here is AA’s policy: Emotional / psychiatric support and fully-trained service animals can fly in the cabin at no charge if they meet the requirements.

Animals must be able to fit at your feet, under your seat or in your lap (animals to be seated on lap must be smaller than a 2-year old child). For safety reasons, you won’t be able to sit in an exit row when traveling with your service or emotional / psychiatric support animal.

Emotional support and service animals cannot:

• Protrude into or block aisles
• Occupy a seat
• Eat from tray tables

If your animal doesn’t fit within the allowed spaces, you may need to:

• Rebook on a flight with more open seats
• Buy a ticket for the animal
• Transport the animal as a checked pet

All restrictions apply to checked pets. Contact the Special Assistance Desk to make arrangements.