AA Pet Carrier Rules (2026): Sizes, Fees, Seats and Documents for Flying American Airlines With a Pet

An AA pet carrier is the bag or kennel American Airlines requires for a cat or dog flying in the cabin, and it must fit under the seat in front of you. As of October 2026, American Airlines recommends a soft-sided carrier up to 18 x 11 x 11 inches. Hard-sided kennels max out at 19 x 13 x 9 inches on mainline jets and 16 x 12 x 8 inches on American Eagle. The fee is $150 per kennel each way.

This guide covers the official carrier sizes, fees, aircraft limits, banned seats, destination restrictions and paperwork. Every rule is attributed to the organization that publishes it. It also explains how airline carrier rules differ from government pet travel documents, and how both differ from the biometric livestock ID that Animal Passport builds.

What size is an AA pet carrier?

American Airlines publishes three carrier limits on its official Traveling with pets page (2026). The soft-sided limit applies to every flight. The hard-sided limit depends on whether the flight is operated by American mainline or by its regional brand, American Eagle.

American Airlines states that soft-sided collapsible kennels "can be slightly larger" as long as they fit under the seat without being excessively collapsed. It also says non-collapsible kennels cannot exceed the under-seat space of any aircraft in your journey. If your trip includes an American Eagle connection, a mainline-size hard case may be refused on the regional leg. The airline tells travelers to contact Reservations to confirm maximum dimensions.

Construction rules for the carrier

According to American Airlines (2026), a soft-sided carrier must be:

• Secure and padded
• Made of water-repellent material
• Ventilated with nylon mesh on 3 or more sides
• Large enough for the pet to fit comfortably with the carrier fully closed or zipped

Third-party summaries do not always match the airline. PetTravel.com, a pet-travel information site, lists a 20-pound combined weight limit, ventilation on four sides for international trips and a waterproof bottom with an absorbent pad. On the official American Airlines page we reviewed in October 2026, the 20-pound (9.07 kg) limit is stated only for the dedicated animal compartments in First and Business on the three-cabin Airbus A321T. If sources disagree, follow the airline's own page and confirm with Reservations.

How much does it cost to bring a pet carrier on American Airlines?

American Airlines charges $150 per kennel for a carry-on pet on flights within and between the United States, Canada, Mexico, Central America and the Caribbean (American Airlines fee table, 2026). Key fee rules from the same page:

• Fees are nonrefundable and apply per kennel, each way.
• A stopover or connection of 4 hours or more triggers a separate fee for each segment.
• Fees are paid at the airport or a travel center by credit card or paper voucher; American does not accept cash or checks.
• American does not collect pet fees for partner airlines, even on codeshare flights with an AA flight number. Check "Operated by" on your ticket and pay each airline separately.
• Fully trained service dogs that meet requirements fly in the cabin at no charge.

The pet carrier replaces part of your cabin allowance. American Airlines says you may bring only one additional item: either a personal item or a carry-on bag that fits in the overhead bin, not both. Pet strollers must be checked at the ticket counter, and checked-bag fees apply.

How many pet carriers are allowed per flight?

Cabin capacity depends on aircraft type. According to American Airlines (2026):

• Airbus A319, A320, A321, A321neo and Boeing 737: up to 20 pet carriers across all cabins; no pets in the premium cabin.
• Boeing 777-200, 777-300ER, 787-8, 787-9 and Airbus A321XLR: up to 20 carriers in total, but none in premium cabins because of a lack of under-seat storage. Row 11 on the A321XLR is excluded.
• Airbus A321T (three-cabin): up to 20 carriers in total. First and Business use 2 dedicated animal-friendly compartments at the front, with a 20-pound pet-plus-carrier limit weighed at check-in.
• American Eagle CRJ-200/700/900, ERJ-145/175/190: 1 carrier in the premium cabin and up to 5 in the main cabin.

Service animals are not counted in these limits. Because space is capped, add your pet to the booking early.

Where can you sit with an AA pet carrier?

American Airlines lists seats where carry-on pets are not permitted, citing Federal Aviation Administration (FAA) safety requirements or a lack of under-seat storage:

• Bulkhead seats
• Exit-row seats
• First and Business on the Boeing 777-200, 777-300ER, 787-8 and 787-9
• Seat 13D on the Airbus A321neo

The pet must stay inside the carrier, under the seat in front of you, for the entire flight.

How to add a carry-on pet on American Airlines: step by step

1. Check eligibility. Only cats and dogs qualify as carry-on pets. Within the U.S. and Puerto Rico they must be at least 8 weeks old (American Airlines, 2026).
2. Check the route. Carry-on pets are allowed on most flights of up to 12 hours within the 48 contiguous states and to Alaska, Canada, Mexico, Puerto Rico, St. Croix and St. Thomas.
3. Measure the carrier against the smallest aircraft on your itinerary.
4. Add the pet online. Find your trip on aa.com or the American app, open Additional Services, select "Add carry-on pets", agree to the requirements, choose your flights and confirm.
5. Pay at the airport. Go to the American ticket counter, where agents take the $150 fee and check the pet and kennel.
6. Do not sedate. Following American Veterinary Medical Association (AVMA) guidance, American Airlines does not accept sedated or tranquilized pets because of higher respiratory and cardiovascular risk at altitude.

Where are carry-on pets not allowed on American Airlines?

As of October 2026, the American Airlines destination rules exclude carry-on pets on:

• Trans-Atlantic and trans-Pacific trips
• Flights to or from Hawaii (checked pets for eligible travelers must connect via Honolulu and follow Hawaii quarantine rules)
• Flights to Jamaica
• Flights to or from Argentina, Brazil, Chile, Colombia and Uruguay

American also refuses dogs as carry-on pets if they originated in, or visited, a country that the U.S. Centers for Disease Control and Prevention (CDC) lists as high-risk for dog rabies in the previous 6 months. Service dogs that meet CDC requirements are exempt. Dogs flying to Mexico need a New World Screwworm (NWS) Inspection Certificate. A USDA-accredited veterinarian must issue it within 5 days before entry, and American verifies it at check-in.

What if your pet is too big for an AA pet carrier?

American Airlines accepts checked pets at the ticket counter only for active-duty U.S. military and U.S. State Department Foreign Service personnel on official orders. The fee is $200 per kennel, or $150 to and from Brazil (American Airlines, 2026). All other pets that cannot fly in the cabin must go through American Airlines Cargo's American PetEmbark service.

According to American Airlines Cargo (2026), pets flying domestically with a combined pet-and-kennel weight under 100 pounds and a kennel no larger than 36 x 26 x 28 inches travel as Priority Parcel Service (PPS). International or larger shipments travel as ExpediteFS. A $150 handling fee per air waybill applies. Cargo will not carry warm-blooded animals when ground temperatures are above 85°F or below 20°F. Between 20°F and 44°F, it requires a veterinarian's acclimation letter. American Airlines Cargo also excludes brachycephalic (snub-nosed) dog and cat breeds such as pugs, bulldogs and Persians.

Carrier rules vs. pet travel documents: what is the difference?

An approved AA pet carrier gets your pet onto the plane. It does not get your pet into a country. Government documents are separate and are set by public authorities:

• United States (dogs): The U.S. Centers for Disease Control and Prevention (CDC) is the primary authority for dogs entering or returning to the U.S. Under rules in force since August 1, 2024, requirements depend on where the dog was vaccinated and which countries it visited in the previous 6 months. The CDC's Dog Importation Navigator tells you which rules apply.
• Leaving the United States: The United States Department of Agriculture Animal and Plant Health Inspection Service (USDA APHIS) tells owners to contact a USDA-accredited veterinarian as soon as they decide to travel. APHIS notes that U.S.-vaccinated dogs visiting a high-risk rabies country need a "Certification of U.S.-Issued Rabies Vaccination" form submitted before departure (APHIS page last modified March 20, 2026).
• European Union: The European pet passport is an EU-standard identification document for dogs, cats and ferrets traveling between EU countries. It is issued only to EU residents by an authorised vet. Pets arriving from outside the EU need an EU animal health certificate issued by an official state vet no more than 10 days before arrival (European Union, Your Europe, 2026).

Rules change often. Check the CDC, USDA APHIS and destination-country pages before every trip, not only when you first book.

How Animal Passport fits in, and what it is not

Many people searching for "pet passport" or "AA pet carrier" are looking for airline or government travel rules. Animal Passport is a different product. It is a digital animal and livestock identity record built on muzzle biometrics: an animal's nose print is unique, much like a human fingerprint.

A phone captures the muzzle image, and the record links the animal to its owner, breed, estimated age, body condition and vaccination history. Age is estimated from a dental photograph and comes with a confidence score. Body condition is scored from 1 to 5 using a side-profile photo. During livestock flood rescue in Pakistan in August 2025, the system helped farmers reclaim animals after paper ear tags washed away.

To be clear: Animal Passport is not an airline carrier approval, an EU pet passport, a USDA health certificate or a CDC import form. It is not a government-issued travel document, and it does not provide veterinary diagnosis or legal advice. For airline travel, follow American Airlines and the government authorities cited above. More guides on animal identification and travel are on the Animal Passport blog.

Pre-flight checklist for an AA pet carrier

• Carrier measured against the smallest aircraft on the route (Eagle hard-sided: 16 x 12 x 8 in)
• Soft sides, padding, water-repellent fabric, mesh on 3+ sides
• Pet can lie and turn comfortably with the carrier zipped
• Carry-on pet added in Additional Services; seat is not a bulkhead or exit row
• $150 per kennel each way budgeted; partner-operated legs paid separately
• No sedatives; crate training started weeks ahead (an alternative endorsed by the International Pet and Animal Transportation Association, IPATA, 2025)
• CDC, USDA APHIS and destination-country documents checked for this trip

By Animal Passport. Last updated October 7, 2026. Airline rules and fees change; verify with American Airlines before you fly.