20 lbs (dog + carrier combined)
Airline dog policy
American Airlines
American Airlines stands out as one of the few major US carriers still offering a cargo program for the general public through its AA Cargo division, in addition to standard in-cabin travel. This makes it a critical option for owners of larger dogs who cannot fit in an under-seat cabin carrier. The airline operates a massive global network with hubs in Dallas-Fort Worth, Charlotte, Miami, Chicago, Philadelphia, and Phoenix, providing excellent connectivity for both domestic and international pet travel.
Book early and confirm aircraft acceptance.
Under-seat dimensions can vary by aircraft.
Fees can change by region and currency.
Booking tip
American enforces a combined weight limit of 20 lbs for dog plus carrier in the cabin, which is stricter than Delta and United (who have no weight limit). Weigh your dog and carrier together before arriving at the airport, as gate agents will verify this. For cargo travel, ground temperatures must be between 45°F and 85°F at every point along the route — this means summer and winter travel can be restricted on certain days. Always call AA Cargo directly to confirm availability and temperature conditions before booking.
Why it can work
American is your best option among the Big Three US carriers if your dog needs to fly cargo, since Delta and United have both suspended civilian cargo. AA Cargo provides temperature-controlled holds and professional handling, though the process requires more documentation and planning than cabin travel. Book cargo at least 2 weeks in advance. For cabin travel, American allows pets in First Class domestically, which is unusual — most carriers restrict pets to economy. Check the specific aircraft; the A321neo has been reported to have insufficient under-seat space for standard carriers.
Restrictions
Dogs must be at least 8 weeks old. Only one pet carrier per passenger. Pets are not allowed on flights longer than 12 hours. American bans cabin pets on routes to/from the UK, Australia, New Zealand, and several other destinations with cargo-only import laws. Sedation is strictly prohibited for both cabin and cargo travel. Brachycephalic breeds may be refused for cargo due to respiratory risks at altitude. No pets on codeshare flights operated by partner airlines unless confirmed with the operating carrier.
Dog-owner notes
American's Miami (MIA) hub is particularly well-positioned for travel to Latin America and the Caribbean. For international travel, you will need a health certificate endorsed by USDA APHIS (if departing the US) within 10 days of travel, plus any destination-specific import permits. American charges the $150 pet fee at the airport during check-in — it cannot be paid in advance. Travel credits and miles cannot be used to pay pet fees. Connecting flights require you to collect and re-check your pet if the operating carrier changes.
Final check before paying
Confirm the exact aircraft, route, dog breed, carrier size, temperature rules and destination import law directly with the airline. A country can allow dogs while a specific airline or aircraft refuses them.