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Here's how airlines decide if a pet qualifies as an emotional support animal

dog on plane
Delta Air Lines announced new regulations requiring additional paperwork from passengers who want to bring emotional support animals onto Delta flights. Julio Cortez / AP
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  • Airlines are worried about passengers bringing fake emotional support animals onto their flights.
  • Delta, American, and United require passengers to provide a signed document from a mental health professional to verify that an emotional support animal is not merely a pet.
  • There are some animals that airlines do not have to accept as emotional support animals, including reptiles, snakes, and spiders.


Airlines are worried about passengers trying to pass off pets as emotional support animals, which fly for free. But airlines are not always clear about what qualifies as an emotional support animal.

Sometimes, it's obvious, like the recent incident involving  a woman who unsuccessfully tried to designate a peacock as an emotional support animal. But in other cases, it might not be as clear where to draw the line between pet and medical necessity.

After Delta Air Lines announced new regulations that require passengers to provide documentation verifying their emotional support animals have been trained and vaccinated, we looked at the rules Delta, United Airlines, and American Airlines set out for emotional support animals. We found that while they require passengers to provide documentation proving their emotional support animals are not merely pets, they leave the job of determining what qualifies as an emotional support animal to licensed medical professionals — with some exceptions. 

Here are the steps passengers have to take to bring an emotional support animal into the main cabin on one of the three major US airlines:

  • American — Passengers must submit a document signed by a licensed doctor or medical health professional which states that the passenger has a "mental health or emotional disability" and needs the animal "for emotional support or psychiatric service" on the flight or at the passenger's destination. The document needs to have been signed within the past year and must be submitted at least 48 hours before the flight.
  • Delta — Starting March 1, passengers will have to submit three documents if they wish to travel with an emotional support animal. In addition to a signed statement from a medical professional, passengers will have to provide vaccination dates and the contact information of the animal's veterinarian and sign a statement that claims the animal is properly trained "to behave in a public setting" and take the passenger's "direction upon command." The document needs to have been signed within the past year and must be submitted at least 48 hours before the flight.
  • United — Passengers must submit a document from a medical or mental health professional which states that the passenger has a "mental health-related disability" and that the emotional support animal "is necessary to the passenger's mental health or treatment." The document needs to have been signed within the past year and must be submitted at least 48 hours before the flight.

While passengers who can complete these steps will often be able to bring their emotional support animals into the cabin with them during a flight, there are some exceptions.

The US Department of Transportation says that airlines don't have to let support animals into the cabin if they're too large, heavy, disruptive, or threatening to the crew and passengers. And airlines don't have to accept ferrets, reptiles, snakes, spiders, or sugar gliders as emotional support animals. American Airlines adds hedgehogs, insects, rodents, amphibians, non-household birds, and any animals with tusks, horns, or hooves, to its no-fly list.

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I'm a senior transportation reporter at Insider covering electric vehicles, automated-driving technology, and ride-hailing. I joined Insider in October 2017 and previously worked as an intern at the St. Louis Post-Dispatch. I graduated from Washington University in St. Louis with degrees in film and media studies and business economics. You can follow me on Twitter @matousekmark and email me at mmatousek@bjinnox.com If you have sensitive information you'd like to share and don't feel comfortable sending it to my work email or via a direct-message on Twitter, you can contact me on the encrypted messaging app Signal at 646-768-4712 or email my encrypted address at mmatousek@protonmail.com. Here's some of my work: Uber insiders are divided over Dara Khosrowshahi's leadership, with some worried the company has become 'boring' and 'confused' about its future Nikola founder Trevor Milton convinced the world he was the next Elon Musk. Insiders say a history of lies brought the billionaire down. 17 hours a day, 7 days a week: Cruise-ship workers describe the grueling conditions they face on the job We talked to 42 insiders about Tesla's factory of the future. They revealed the corners cut to hit ambitious production targets. 70-hour weeks and 'WTF' emails: 42 employees reveal the frenzy of working at Tesla under the 'cult' of Elon Musk Tesla is transforming how cars are sold. But 27 insiders say the company's methods mean slashed pay and living under the constant threat of getting laid off. Uber insiders reveal how DoorDash stole its delivery crown and left Eats in the dust Uber's trying no-meeting Mondays to give employees a break from 'tiring' back-to-back meetings, a leaked email reveals Leaked email reveals a Tesla VP expressed concern about employees coming to work with COVID-19 symptoms Leaked document reveals Nikola flip-flopped on whether it would spend any of its $17 million of customer deposits to fund the Nikola One Insiders reveal Alibaba's Jack Ma sought a partnership with Canoo to build electric delivery vans, but the deal fell flat because the startup couldn't meet his aggressive timeline Leaked email from Elon Musk reveals the Model Y is experiencing production 'challenges' while passing the Model 3 as the top priority at Tesla's US car factory Leaked email and audio reveal Carnival-owned Holland America has struggled to give refunds to some customers Leaked documents reveal the severance packages laid off Carnival UK workers will receive Inside Tesla's overhaul plan for its sales and delivery teams to solve one of its toughest customer challenges