A trained service dog flies in the cabin with you, and the only paperwork a US airline may ask for is the U.S. Department of Transportation Service Animal Air Transportation Form, plus a relief form on flights of 8 hours or more. Emotional support animals and dogs still in training are not service animals under the 2021 DOT rule, so airlines treat them as pets. No registry, ID card, vest or certificate replaces the DOT form, and none gets a pet into the cabin for free.
What US airlines must allow
Air travel is not covered by the ADA. It runs on the Air Carrier Access Act and the Department of Transportation's rule at 14 CFR Part 382, rewritten in a final rule that took effect on January 11, 2021. That rule defines a service animal narrowly:
"Service animal means a dog, regardless of breed or type, that is individually trained to do work or perform tasks for the benefit of a qualified individual with a disability, including a physical, sensory, psychiatric, intellectual, or other mental disability. Animal species other than dogs, emotional support animals, comfort animals, companionship animals, and service animals in training are not service animals for the purposes of this part."14 CFR 382.3
If your dog fits that definition, the DOT says airlines "are required to recognize dogs as service animals and accept them for transport on flights to, within and from the United States." A few other protections come with it:
- No breed bans. An airline "must not deny transportation to a service animal based on the animal's breed or type" (14 CFR 382.72). Delta, Southwest and Allegiant write "regardless of breed" into their own rules.
- Other people's comfort is not a reason. The DOT's guidance says airlines "cannot refuse to allow your service animal onboard because it makes other passengers or flight crew uncomfortable".
- No forced trip to the counter. An airline cannot make you check in in person just because you have a service dog (14 CFR 382.76).
- Refusal needs a reason. A dog can be refused only after an individual assessment (for example a direct threat or significant disruption, or missing forms), and the airline must give you the reason in writing within 10 calendar days (14 CFR 382.79).
What an airline may do to decide: ask what work or task the dog has been trained to perform, look for physical indicators such as a harness or vest, check that the dog is harnessed, leashed or tethered, and watch its behavior. If something goes wrong at the airport, ask for the airline's Complaints Resolution Official.
The DOT form: the only document an airline can require
Under 14 CFR 382.75 an airline may require "a current completed U.S. Department of Transportation Service Animal Air Transportation Form", plus the Relief Attestation form for a segment of 8 hours or more, and nothing else (apart from the animal health rules of another government). "Current" means you filled it out on or after the day you bought the ticket.
- If you booked more than 48 hours ahead, the airline may ask for the form up to 48 hours before the flight.
- If you booked later, the airline must let you hand it in at the gate on the day of travel.
- An airline may ask for the form once per trip, not once per flight. A round trip counts as one trip.
- The form goes to the airline. The DOT's own instructions say "Do not submit the form to DOT."
Our step-by-step guide to filling out the DOT service animal form covers every field, the relief form and where each airline wants it.
A registration number or ID card does nothing here. Southwest says it outright: "A service animal vest, harness, ID card, or registration certificate will not be accepted in place of the form." Delta says its rules "still apply to customers with NSAR memberships". If you keep a voluntary record with us, treat it as a place for your emergency contact and vet details, not as flight paperwork.
Where does a service dog sit on a plane?
On your lap or on the floor in front of your seat. The rule (14 CFR 382.77) keeps the dog in your own lap or foot space. It may not sit in a seat, block the aisle, eat from a tray table, or spread into your neighbor's space, and no airline lets a service dog ride in an emergency exit row.
Each airline words the lap limit differently: "smaller than a 2-year old child" (American), "no larger than a child under the age of two" (Southwest, Frontier), "no larger than an infant" (Alaska and Hawaiian), or "approximately 30 lbs." (Allegiant).
If a large dog does not fit, the rule says the airline should first look for another seat in the same class where it will fit. If there is none, the options are carrying the dog in the cargo hold free of charge or moving you to a later flight. Several airlines also let you buy a second seat so the dog can use its floor space (Delta, American, JetBlue, Allegiant).
How many service dogs can you bring?
Two. The rule lets airlines refuse "more than two service animals for a single passenger" (14 CFR 382.74), and every US airline covered here uses that limit. Each dog needs its own DOT form. United also allows one service dog plus one pet if you buy the seat next to you, and Frontier lets a service dog handler bring one cabin pet as well.
Can emotional support animals fly?
Yes, but as pets. Since 2021 the DOT rule says "Carriers are not required to recognize emotional support animals as service animals and may treat them as pets", and every US airline we checked does exactly that. An ESA flies in a carrier under the seat for the airline's pet fee, which ran from $50 (Allegiant) to $150 (Delta, United, American, JetBlue) each way in September 2026. The full comparison is in can emotional support animals fly?
A dog that is trained to perform a task for a psychiatric disability is different. It is a service dog, and the DOT says "Psychiatric service animals will be subject to the same regulations as other service animals." See psychiatric service dogs for how that line is drawn.
Can service dogs in training fly?
Not as service dogs. The DOT form's instructions list "service animals in training" among the animals that are not service animals. Some airlines make their own exceptions:
- Alaska and Hawaiian: may accept, free, at their discretion: a trainer delivering a finished dog, or a puppy raiser with an organization's Trainer ID card on flights within the US.
- Southwest: only Canine Companions (CCI) dogs in training, at no charge.
- Allegiant: case by case, with 72 hours' notice.
- United: its web page says no, but its contract of carriage allows a trainer one dog in training for free. Ask in writing.
- Delta: only a professional trainer taking the dog to its owner.
- American: as a pet. JetBlue and Frontier: not accepted.
On the ground, see service dogs in training.
International flights and Hawaii
The DOT form covers the airline. It does not cover the country you land in. Your destination sets its own entry rules, and a dog coming back into the US must be at least six months old, microchipped and have a CDC Dog Import Form receipt, with no exemption for service dogs. Read international flights with a service dog before you book.
Hawaii is part of the US but is rabies-free and has its own entry rules for every dog, service dogs included. Start with Hawaiian Airlines and Hawaii's dog entry rules.
Airline-by-airline table
What each airline's own pages said when we checked them on 2026-09-25. Fees are one way, per pet or carrier.
| Airline | DOT form | Dogs in training | ESA (as a pet) |
|---|---|---|---|
| Delta | Online with a Delta request, 48 hours ahead | Professional trainer delivering only | $150 |
| United | In Trip details or MileagePlus, 48 hours ahead | Web says no; contract says one | $150 |
| American | Online 48 hours ahead or at the airport; reusable SVAN ID | As a pet | $150 per kennel |
| Southwest | Shown at the counter or gate on the day | CCI dogs only | $125 |
| Alaska and Hawaiian | Open Doors portal, 48 hours ahead recommended | At its discretion, free | $100 ($35 within Hawaii) |
| JetBlue | Open Doors portal or mail, 48 hours ahead | Not accepted | $150 |
| Frontier | Upload or mail by 48 hours ahead | Not accepted | $149 |
| Allegiant | Open Doors portal, 48 hours ahead | Case by case, 72 hours' notice | $50 |
| Spirit | Stopped flying on May 2, 2026 | ||
Gear that makes flying smoother
No vest is required to fly. The DOT's 2020 rule says airlines "are free to view such paraphernalia as evidence that an animal is a service animal; conversely, they are also free to give the presence or lack of presence of such paraphernalia little weight."
What does matter on the day: the DOT form has you acknowledge that the dog will be "harnessed, leashed, or tethered at all times in the airport and on the aircraft", so bring a leash you can shorten in a tight foot well. A clearly marked service dog vest can cut down on strangers reaching for your dog in the gate area, which is its real job. Pack a printed copy of your form and any approval email as well.
All guides in this section
- The DOT Service Animal Air Transportation Form, field by fieldThe DOT service animal form is the only document a US airline may require for a service dog. Where to get the PDF, how to fill it out and when to send it.
- Delta service animal policy: service dogs, ESAs and the DOT formDelta flies trained service dogs free with the DOT form sent 48 hours ahead. ESAs fly as pets for $150 each way. What Delta requires, checked 2026-09-25.
- United Airlines service animal policy: service dogs, ESAs and the DOT formUnited flies up to two trained service dogs free with the DOT form 48 hours ahead. ESAs fly as pets for $150 each way. United's rules, as of September 2026.
- American Airlines service animal policy: SVAN ID, ESAs and the DOT formAmerican flies trained service dogs with the DOT form and a reusable SVAN ID. ESAs fly as pets for $150 per kennel. American's rules, as of September 2026.
- Southwest service animal policy: the DOT form on the day, and ESAs as petsSouthwest checks the DOT service animal form at the counter or gate on your travel day. ESAs fly as pets for $125 each way. Southwest's rules, checked 2026-09-25.
- Alaska Airlines service animal policy: the Open Doors portal, ESAs and dogs in trainingAlaska and Hawaiian share one policy: the DOT form via the Open Doors portal 48 hours ahead, up to two dogs, ESAs as pets for $100. Checked 2026-09-25.
- JetBlue service animal policy: service dogs, ESAs and the DOT formJetBlue carries trained service dogs with the DOT form sent 48 hours ahead by portal or mail. It accepts ESAs only as small pets, $150 each way. Checked 2026-09-25.
- Spirit Airlines service animal policy: Spirit stopped flying in May 2026Spirit Airlines stopped flying on May 2, 2026, so its service animal and ESA rules no longer apply. What to expect instead on Frontier, Allegiant and others.
- Frontier Airlines service animal policy: the 48-hour form deadline and ESAs as petsFrontier needs the DOT service animal form uploaded or mailed 48 hours ahead. It stopped accepting ESAs in 2021; they fly as pets for $149. Checked 2026-09-25.
- Hawaiian Airlines service animal policy, and Hawaii's entry rules for any dogHawaiian now uses Alaska's service animal policy, and every dog entering Hawaii must meet state rabies rules. ESAs fly as pets. What to do, as of 2026-09-25.
- Allegiant service animal policy: the DOT form, dogs in training and ESAsAllegiant takes the DOT service animal form through the Open Doors portal 48 hours ahead. ESAs fly as $50 cabin pets. Allegiant's rules, as of September 2026.
- International flights with a service dog: airline rules and country rulesOn international flights your service dog needs the airline's DOT form plus the destination's animal health papers, and CDC rules to come home. A checklist.
Common questions
Do service dogs fly free?
Yes on the airlines we checked. Delta and United say so outright, and none lists a fee for a service dog in the cabin. You may have to buy a second seat if a large dog does not fit in your foot space.
Do I need service dog certification to fly?
No. Airlines may require only the DOT forms. A certificate, registration or ID card does not replace them, and Southwest says it will not accept one in place of the form.
Can an airline ask what my service dog does?
Yes. Airlines may ask what work or task the dog has been trained to perform. They may not ask for proof beyond the DOT forms.
Can my emotional support dog fly in the cabin?
Only as a pet, in a carrier that fits under the seat, for the airline's pet fee. See can emotional support animals fly?
Does the DOT form have to be filled out for every flight?
Airlines may ask once per trip, not per flight, and a round trip is one trip. Some airlines keep an approval on file: American's SVAN ID and the Open Doors portal ID used by Alaska and Hawaiian last until the rabies vaccination expires.
Sources
- U.S. DOT, Service Animals (Aviation Consumer Protection)
- 14 CFR 382.3, definition of service animal
- 14 CFR 382.75, documentation airlines may require
- 14 CFR 382.77, seating and large animals
- DOT final rule, 85 FR 79742 (2020-12-10)
- DOT Service Animal Air Transportation Form (revision 9.20.24)
- CDC, dog importation FAQ
General information, not legal advice. Policies and laws change; follow the sources. Last checked September 25, 2026.